Archive for the ‘Recover MCU’ Category

PostHeaderIcon ARM STM32F072CB Microcomputer Firmware Restoration

ARM STM32F072CB Microcomputer Firmware Restoration can help engineer to extract embedded source code from stm32f072cb mcu chip flash memory, after unlock tamper resistance system of stm32f072cb microprocessor;

ARM STM32F072CB Microcomputer Firmware Restoration can help engineer to extract embedded source code from stm32f072cb mcu chip flash memory, after unlock tamper resistance system of stm32f072cb microprocessor
ARM STM32F072CB Microcomputer Firmware Restoration can help engineer to extract embedded source code from stm32f072cb mcu chip flash memory, after unlock tamper resistance system of stm32f072cb microprocessor

The CRC (cyclic redundancy check) calculation unit is used to get a CRC code using a configurable generator polynomial value and size. Among other applications, CRC-based techniques are used to verify data transmission or storage integrity.

In the scope of the EN/IEC 60335-1 standard, they offer a means of verifying the Flash memory integrity. The CRC calculation unit helps compute a signature of the software during runtime when decrypt the source code of stm32f071v8 mcu chip, to be compared with a reference signature generated at link- time and stored at a given memory location.

VDD = VDDIO1 = 2.0 to 3.6 V: external power supply for I/Os (VDDIO1) and the internal regulator. It is provided externally through VDD pins.

Il ripristino del firmware del microcomputer ARM STM32F072CB può aiutare l'ingegnere a estrarre il codice sorgente incorporato dalla memoria flash del chip MCU STM32F072CB, dopo aver sbloccato il sistema di resistenza alla manomissione del microprocessore STM32F072CB;

Il ripristino del firmware del microcomputer ARM STM32F072CB può aiutare l’ingegnere a estrarre il codice sorgente incorporato dalla memoria flash del chip MCU STM32F072CB, dopo aver sbloccato il sistema di resistenza alla manomissione del microprocessore STM32F072CB;

VDDA = from VDD to 3.6 V: external analog power supply for ADC, DAC, Reset blocks, RCs and PLL (minimum voltage to be applied to VDDA is 2.4 V when the ADC or DAC are used). It is provided externally through VDDA pin. The VDDA voltage level must be always greater or equal to the VDD voltage level and must be established first.

VDDIO2 = 1.65 to 3.6 V: external power supply for marked I/Os. VDDIO2 is provided externally through the VDDIO2 pin. The VDDIO2 voltage level is completely independent from VDD or VDDA, but it must not be provided without a valid supply on VDD. The VDDIO2 supply is monitored and compared with the internal reference voltage (VREFINT) after reverse engineering stm32f071r8 arm microcomputer flash program. When the VDDIO2 is below this threshold, all the I/Os supplied from this rail are disabled by hardware. The output of this comparator is connected to EXTI line 31 and it can be used to generate an interrupt. Refer to the pinout diagrams or tables for concerned I/Os list.

VBAT = 1.65 to 3.6 V: power supply for RTC, external clock 32 kHz oscillator and backup registers (through power switch) when VDD is not present.

PostHeaderIcon Recover STM8S207C6 Secured Microcontroller Flash Heximal

Recover STM8S207C6 Secured Microcontroller Flash Heximal from memory after crack mcu stm8s207c6 security fuse bit and readout embedded firmware from microprocessor stm8s207c6 memory;

Recover STM8S207C6 Secured Microcontroller Flash Heximal from memory after crack mcu stm8s207c6 security fuse bit and readout embedded firmware from microprocessor stm8s207c6 memory;

The STM8S20xxx performance line 8-bit microcontrollers offer from 32 to 128 Kbytes Flash program memory. They are referred to as high-density devices in the STM8S microcontroller family reference manual.

All STM8S20xxx devices provide the following benefits: reduced system cost, performance robustness, short development cycles, and product longevity.

Stellen Sie den gesicherten Mikrocontroller-Flash-Speicher STM8S207C6 aus dem Speicher wieder her, nachdem das Sicherheitssicherungsbit der MCU STM8S207C6 geknackt und die eingebettete Firmware aus dem Speicher des Mikroprozessors STM8S207C6 ausgelesen wurde.

Stellen Sie den gesicherten Mikrocontroller-Flash-Speicher STM8S207C6 aus dem Speicher wieder her, nachdem das Sicherheitssicherungsbit der MCU STM8S207C6 geknackt und die eingebettete Firmware aus dem Speicher des Mikroprozessors STM8S207C6 ausgelesen wurde.

The system cost is reduced thanks to an integrated true data EEPROM for up to 300 k write/erase cycles and a high system integration level with internal clock oscillators, watchdog, and brown-out reset which become important reason to break stm8s103k3 mcu protection.

Device performance is ensured by 20 MIPS at 24 MHz CPU clock frequency and enhanced characteristics which include robust I/O, independent watchdogs (with a separate clock source), and a clock security system.

Short development cycles are guaranteed due to application scalability across a common family product architecture with compatible pinout, memory map and modular peripherals.

Full documentation is offered with a wide choice of development tools. Product longevity is ensured in the STM8S family thanks to their advanced core which is made in a state-of-the art technology for applications with 2.95 V to 5.5 V operating supply after breaking stm8s103f3 micro cpu flash memory.

PostHeaderIcon Recover STM8S005K6T6 Microcontroller data Eeprom Content

Recover STM8S005K6T6 Microcontroller data Eeprom Content needs to crack fuse bit of stm8s005k6 secured memory and then extract heximal code from stm8s005k6 processor’s encrypted memory;

Recover STM8S005K6T6 Microcontroller data Eeprom Content needs to crack fuse bit of stm8s005k6 secured memory and then extract heximal code from stm8s005k6 processor’s encrypted memory;

The clock controller distributes the system clock (fMASTER) coming from different oscillators to the core and the peripherals. It also manages clock gating for low power modes and ensures clock robustness.

Clock prescaler: to get the best compromise between speed and current consumption the clock frequency to the CPU and peripherals can be adjusted by a programmable prescaler which can be used for clone microcontroller stm8s003f2 flash source code;

récupérer les données du microcontrôleur STM8S005K6T6, le contenu de l'eeprom doit craquer le bit de fusible de la mémoire sécurisée stm8s005k6, puis extraire le code hexadécimal de la mémoire chiffrée du processeur stm8s005k6 ;

récupérer les données du microcontrôleur STM8S005K6T6, le contenu de l’eeprom doit craquer le bit de fusible de la mémoire sécurisée stm8s005k6, puis extraire le code hexadécimal de la mémoire chiffrée du processeur stm8s005k6 ;

Safe clock switching: clock sources can be changed safely on the fly in run mode through a configuration register. The clock signal is not switched until the new clock source is ready. The design guarantees glitch-free switching.

Peripheral clock gating bit assignments in CLK_PCKENR1/2 registers
Peripheral clock gating bit assignments in CLK_PCKENR1/2 registers

Clock management: to reduce power consumption, the clock controller can stop the clock to the core, individual peripherals or memory.

Master clock sources: four different clock sources can be used to drive the master clock:

1-16 MHz high-speed external crystal (HSE)

Up to 16 MHz high-speed user-external clock (HSE user-ext)

16 MHz high-speed internal RC oscillator (HSI)

128 kHz low-speed internal RC (LSI)

crack STM8S005K6T6 arm microcompute fuse bit and readout embedded firmware from flash and eeprom memory

crack STM8S005K6T6 arm microcompute fuse bit and readout embedded firmware from flash and eeprom memory

Startup clock: After reset, the microcontroller restarts by default with an internal 2 MHz clock (HSI/8). The prescaler ratio and clock source can be changed by the application program as soon as the code execution starts in the process of restore stm8s103k3 mcu chip embedded flash firmware.

Clock security system (CSS): This feature can be enabled by software. If an HSE clock failure occurs, the internal RC (16 MHz/8) is automatically selected by the CSS and an interrupt can optionally be generated.

Configurable main clock output (CCO): This outputs an external clock for use by the application.

PostHeaderIcon Recover Embedded Microprocessor MSP430G2131 Flash Software

Recover Embedded Microprocessor MSP430G2131 Flash Software is extract the locked firmware from mcu msp430g2131 flash memory after crack texas instrument msp430g2131 flash memory fuse bit;

Recover Embedded Microprocessor MSP430G2131 Flash Software is extract the locked firmware from mcu msp430g2131 flash memory after crack texas instrument msp430g2131 flash memory fuse bit
Recover Embedded Microprocessor MSP430G2131 Flash Software is extract the locked firmware from mcu msp430g2131 flash memory after crack texas instrument msp430g2131 flash memory fuse bit

The MSP430 bootstrap loader (BSL) enables users to program the flash memory or RAM using a UART serial interface. Access to the MSP430 memory via the BSL is protected by user-defined password which can provide convenience for breaking msp430g2452 microcontroller flash memory. For complete description of the features of the BSL and its implementation, see the MSP430 Programming Via the Bootstrap Loader User’s Guide.

फ्लैश सॉफ्टवेयर MSP430G2131 एम्बेडेड माइक्रोप्रोसेसर पुनर्प्राप्त करें टेक्सास उपकरण एमएसपी 430 जी 2131 फ्लैश मेमोरी फ्यूज बिट को क्रैक करने के बाद एमसीयू एमएसपी 430 जी 2131 फ्लैश मेमोरी से लॉक किए गए फर्मवेयर को निकालता है;

फ्लैश सॉफ्टवेयर MSP430G2131 एम्बेडेड माइक्रोप्रोसेसर पुनर्प्राप्त करें टेक्सास उपकरण एमएसपी 430 जी 2131 फ्लैश मेमोरी फ्यूज बिट को क्रैक करने के बाद एमसीयू एमएसपी 430 जी 2131 फ्लैश मेमोरी से लॉक किए गए फर्मवेयर को निकालता है;

The flash memory can be programmed via the JTAG port, the bootstrap loader, or in-system by the CPU. The CPU can perform single-byte and single-word writes to the flash memory. Features of the flash memory include:

  • Flash memory has n segments of main memory and four segments of information memory (A to D) of 64 bytes each. Each segment in main memory is 512 bytes in size.
    • Segments 0 to n may be erased in one step, or each segment may be individually erased.
    • Segments A to D can be erased individually, or as a group with segments 0 to n. Segments A to D are also called information memory.

Segment A contains calibration data. After reset, segment A is protected against programming and erasing by attacking ti mcu cpu msp430g2544 flash memory. It can be unlocked, but care should be taken not to erase this segment if the device-specific calibration data is required.

PostHeaderIcon Microchip Microprocessor PIC18F85K22 Flash Memory Content Recovery

Microchip Microprocessor PIC18F85K22 Flash Memory Content Recovery will start from delayer the MCU and remove fuse bit protection over the memory by crack MCU through focus ion beam, and extract embedded firmware from microcontroller both flash and eeprom memory;

Microchip Microprocessor PIC18F85K22 Flash Memory Content Recovery will start from delayer the MCU and remove fuse bit protection over the memory by crack MCU through focus ion beam, and extract embedded firmware from microcontroller both flash and eeprom memory;
Microchip Microprocessor PIC18F85K22 Flash Memory Content Recovery will start from delayer the MCU and remove fuse bit protection over the memory by crack MCU through focus ion beam, and extract embedded firmware from microcontroller both flash and eeprom memory;

The sequence of events that takes place when switching from the Timer1 oscillator to the main oscillator will depend on the mode of the main oscillator. In addition to eight clock cycles of the main oscillator, additional delays may take place.

If the main oscillator is configured for an external crystal (HS, XT, LP), then the transition will take place after an oscillator start-up time (TOST) has occurred. A timing diagram, indicating the transition from the Timer1 oscillator to the main oscillator for HS, XT and LP modes

mikroçip mikroişlemci PIC18F85K22 flash bellek içerik kurtarma, MCU'nun katmanını çözmekten başlayacak ve odak iyon ışını aracılığıyla MCU'yu kırarak bellek üzerindeki sigorta biti korumasını kaldıracak ve mikrodenetleyiciden gömülü bellenimi hem flash hem de eeprom belleğinden çıkaracaktır;

mikroçip mikroişlemci PIC18F85K22 flash bellek içerik kurtarma, MCU’nun katmanını çözmekten başlayacak ve odak iyon ışını aracılığıyla MCU’yu kırarak bellek üzerindeki sigorta biti korumasını kaldıracak ve mikrodenetleyiciden gömülü bellenimi hem flash hem de eeprom belleğinden çıkaracaktır;

If the main oscillator is configured for HS-PLL mode, an oscillator start-up time (TOST), plus an additional PLL time-out (TPLL), will occur. The PLL time-out is typically 2 ms and allows the PLL to lock to the main oscillator frequency. A timing diagram, indicating the transition from the Timer1 oscillator to the main oscillator for HS-PLL mode.

If the main oscillator is configured in the RC, RCIO, EC or ECIO modes, there is no oscillator start-up time-out. Operation will resume after eight cycles of the main oscillator have been counted by restoring microchip mcu pic18f66k80 controller embedded firmware. A timing diagram, indicating the transition from the Timer1 oscillator to the main oscillator for RC, RCIO, EC and ECIO modes.

мікрочіп мікропроцесор PIC18F85K22 відновлення вмісту флеш-пам'яті почнеться з дешарування MCU і зніме захист біта запобіжника над пам'яттю шляхом злому MCU через промінь фокусування іона, і витягне вбудовану прошивку з мікроконтролера як флеш, так і eeprom пам'яті;

мікрочіп мікропроцесор PIC18F85K22 відновлення вмісту флеш-пам’яті почнеться з дешарування MCU і зніме захист біта запобіжника над пам’яттю шляхом злому MCU через промінь фокусування іона, і витягне вбудовану прошивку з мікроконтролера як флеш, так і eeprom пам’яті;

When the device executes a SLEEP instruction, the on-chip clocks and oscillator are turned off and the device is held at the beginning of an instruction cycle (Q1 state). With the oscillator off, the OSC1 and OSC2 signals will stop oscillating. Since all the transistor switching currents have been removed, Sleep mode achieves the lowest current consumption of the device (only leakage currents). Enabling any on-chip feature that will operate during Sleep will increase the current consumed during Sleep when engineer try to recovering content from MCU.

PostHeaderIcon Restore MSP430G2352 Microcontroller Flash Memory Binary

Restore MSP430G2352 Microcontroller Flash Memory Binary and copy firmware to new MCU MSP430G2352 which can provide the same functions as original version, the status of MSP430G2352 will be modified by MCU cracking from locked to unlocked one;

Restore MSP430G2352 Microcontroller Flash Memory Binary and copy firmware to new MCU MSP430G2352 which can provide the same functions as original version, the status of MSP430G2352 will be modified by MCU cracking from locked to unlocked one
Restore MSP430G2352 Microcontroller Flash Memory Binary and copy firmware to new MCU MSP430G2352 which can provide the same functions as original version, the status of MSP430G2352 will be modified by MCU cracking from locked to unlocked one
  • The external reference is used during conversion to charge and discharge the capacitance array. The input capacitance, CI, is also the dynamic load for an external reference during conversion. The dynamic impedance of the reference supply should follow the recommendations on analog-source impedance to allow the charge to settle for 10-bit accuracy.
Wiederherstellen MSP430G2352 Mikrocontroller-Flash-Speicher-Binärdatei und Kopieren der Firmware auf neue MCU-MSP430G2352 die die gleichen Funktionen wie die Originalversion bieten kann, wird der Status der MSP430G2352 durch MCU-Cracking von gesperrt auf entsperrt geändert;

Wiederherstellen MSP430G2352 Mikrocontroller-Flash-Speicher-Binärdatei und Kopieren der Firmware auf neue MCU-MSP430G2352 die die gleichen Funktionen wie die Originalversion bieten kann, wird der Status der MSP430G2352 durch MCU-Cracking von gesperrt auf entsperrt geändert;

  • The accuracy limits the minimum positive external reference voltage. Lower reference voltage levels may be applied with reduced accuracy requirements when restoring msp430g2101 flash content.
  • Under this condition the external reference is internally buffered. The reference buffer is active and requires the reference buffer supply current IREFB. The current consumption can be limited to the sample and conversion period with REBURST = 1.
  • The accuracy limits the maximum negative external reference voltage. Higher reference voltage levels may be applied with reduced accuracy requirements.
ripristinare MSP430G2352 binario della memoria flash del microcontrollore e copiare il firmware sul nuovo MCU MSP430G2352 che può fornire le stesse funzioni della versione originale, lo stato di MSP430G2352 verrà modificato dal cracking dell'MCU da bloccato a sbloccato;

ripristinare MSP430G2352 binario della memoria flash del microcontrollore e copiare il firmware sul nuovo MCU MSP430G2352 che può fornire le stesse funzioni della versione originale, lo stato di MSP430G2352 verrà modificato dal cracking dell’MCU da bloccato a sbloccato;

  • The accuracy limits the minimum external differential reference voltage. Lower differential reference voltage levels may be applied with reduced accuracy requirements.
10-Bit ADC, External Reference
10-Bit ADC, External Reference

 

PostHeaderIcon Restore Texas Instrument MSP430G2001 Microcontroller Heximal Program

Restore Texas Instrument MSP430G2001 Microcontroller Heximal Program from embedded flash memory after crack microcontroller msp430g2001 security fuse bit and extract IC code;

Restore Texas Instrument MSP430G2001 Microcontroller Heximal Program from embedded flash memory after crack microcontroller msp430g2001 security fuse bit and extract IC code;
Restore Texas Instrument MSP430G2001 Microcontroller Heximal Program from embedded flash memory after crack microcontroller msp430g2001 security fuse bit and extract IC code;

The MSP430 CPU has a 16-bit RISC  architecture that is highly transparent to the application. All operations, other than program-flow instructions, are performed as register operations in conjunction with seven addressing modes for source operand and four addressing modes for destination operand.

The CPU is integrated with 16 registers that provide reduced instruction execution time. The register-to-register operation execution time is one cycle of the CPU clock.

Four of the registers, R0 to R3, are dedicated as program counter, stack pointer, status register, and constant generator, respectively. The remaining registers are general-purpose registers.

Peripherals are connected to the CPU using data, address, and control buses, and can be handled with all instructions. The instruction set consists of the original 51 instructions with three formats and seven address modes and additional instructions for the expanded address range. Each instruction can operate on word and byte data to increase the success rate of msp430g2452 microcontroller flash memory protection breaking.

PostHeaderIcon Restore Microcontroller STM32F103C8 Flash Program Code

Restore Microcontroller STM32F103C8 Flash Program Code and copy extracted firmware to new MCU in order to make STM32F103C8 binary code microprocessor cloning;

Restore Microcontroller STM32F103C8 Flash Program Code and copy extracted firmware to new MCU in order to make STM32F103C8 binary code microprocessor cloning
Restore Microcontroller STM32F103C8 Flash Program Code and copy extracted firmware to new MCU in order to make STM32F103C8 binary code microprocessor cloning

The current consumption of the on-chip peripherals is given in Table 18. The process of Recover MCU is placed under the following conditions:

restaurar o microcontrolador STM32F103C8 código do programa flash e copiar o firmware extraído para o novo MCU, a fim de fazer STM32F103C8 clonagem de microprocessador de código binário;

restaurar o microcontrolador STM32F103C8 código do programa flash e copiar o firmware extraído para o novo MCU, a fim de fazer STM32F103C8 clonagem de microprocessador de código binário;

  • l all I/O pins are in input mode with a static value at VDD or VSS (no load)
  • l all peripherals are disabled unless otherwise mentioned
  • l the given value is calculated by measuring the current consumption
    • – with all peripherals clocked off
    • – with only one peripheral clocked on
  • l ambient operating temperature and VDD supply voltage conditions summarized

External clock source characteristics includes below points:

In a given sampling window, either three or six samples of the input signal are taken to determine the validity of the signal. This is determined by the value written to GPxQSELn register to recover stmicro stm32f103c6 mcu flash content.

ripristinare il microcontrollore STM32F103C8 il codice del programma flash e copiare il firmware estratto sul nuovo MCU per effettuare STM32F103C8 clonazione del microprocessore in codice binario;

ripristinare il microcontrollore STM32F103C8 il codice del programma flash e copiare il firmware estratto sul nuovo MCU per effettuare STM32F103C8 clonazione del microprocessore in codice binario;

Case 1:

Qualification using three samples

Sampling window width = (SYSCLKOUT cycle × 2 × QUALPRD) × 2, if QUALPRD ≠ 0 Sampling window width = (SYSCLKOUT cycle) × 2, if QUALPRD = 0

casser données heximales eeprom du microcontrôleur stm32f103c8,

casser données heximales eeprom du microcontrôleur stm32f103c8,

Case 2:

Qualification using six samples Sampling window width = (SYSCLKOUT cycle × 2 × QUALPRD) × 5, if QUALPRD ≠ 0 Sampling window width = (SYSCLKOUT cycle) × 5, if QUALPRD = 0

копировать зашифрованная программа встроенной прошивки MCU stm32f103c8 IC,

копировать зашифрованная программа встроенной прошивки MCU stm32f103c8 IC,

PostHeaderIcon Recovering ARM Microprocessor STM32F103CB Flash Program

Recovering ARM Microprocessor STM32F103CB Flash Program after crack mcu stm32f103cb security fuse bit and disable the protection over the memory content, copy extracted firmware to new MCU;

Recovering ARM Microprocessor STM32F103CB Flash Program after crack mcu stm32f103cb security fuse bit and disable the protection over the memory content, copy extracted firmware to new MCU
Recovering ARM Microprocessor STM32F103CB Flash Program after crack mcu stm32f103cb security fuse bit and disable the protection over the memory content, copy extracted firmware to new MCU

The low-speed external (LSE) clock can be supplied with a 32.768 kHz crystal/ceramic resonator oscillator by Crack STM32F103CB Microcontroller Flash Memory. All the information given in this paragraph are based on characterization results obtained with typical external components specified in below Table.

копировать двоичный файл памяти защищенного микрокомпьютера stm32f103c4

копировать двоичный файл памяти защищенного микрокомпьютера stm32f103c4

In the application, the resonator and the load capacitors have to be placed as close as possible to the oscillator pins in order to minimize output distortion and startup stabilization time. Refer to the crystal resonator manufacturer for more details on the resonator characteristics when break arm mcu stm32f101cb flash memory (frequency, package, accuracy).

brechen Quellcode der stm32f103c4 MCU-Chip-Speichersoftware,

brechen Quellcode der stm32f103c4 MCU-Chip-Speichersoftware,

For CL1 and CL2 it is recommended to use high-quality ceramic capacitors in the 5 pF to 15 pF range selected to match the requirements of the crystal or resonator when Break IC Flash. CL1 and CL2, are usually the same size. The crystal manufacturer typically specifies a load capacitance which is the series combination of CL1 and CL2.

PostHeaderIcon Restoring ARM Microcontroller STM32F103C4 Flash Binary

Restoring ARM Microcontroller STM32F103C4 Flash Binary after crack locked mcu stm32f103c4 security fuse bit and copy extracted firmware to new Microcontroller;

Restoring ARM Microcontroller STM32F103C4 Flash Binary after crack locked mcu stm32f103c4 security fuse bit and copy extracted firmware to new Microcontroller
Restoring ARM Microcontroller STM32F103C4 Flash Binary after crack locked mcu stm32f103c4 security fuse bit and copy extracted firmware to new Microcontroller

The temperature sensor has to generate a voltage that varies linearly with temperature to Recover MCU content. The conversion range is between 2 V < VDDA < 3.6 V. The temperature sensor is internally connected to the ADC1_IN16 input channel which is used to convert the sensor output voltage into a digital value.

The ARM SWJ-DP Interface is embedded, and is a combined JTAG and serial wire debug port that enables either a serial wire debug or a JTAG probe to be connected to the target of STMicro STM32F101RB MCU flash memory breaking. The JTAG TMS and TCK pins are shared respectively with SWDIO and SWCLK and a specific sequence on the TMS pin is used to switch between JTAG-DP and SW-DP.

copiar Código fuente del software de memoria del chip MCU stm32f103cB

copiar Código fuente del software de memoria del chip MCU stm32f103cB

Unless otherwise specified the minimum and maximum values in the process of Unlock ARM Base STM32F101CB Microprocessor are guaranteed in the worst conditions of ambient temperature, supply voltage and frequencies by tests in production on 100% of the devices with an ambient temperature at TA = 25 °C and TA = TAmax (given by the selected temperature range).

Data based on characterization results, design simulation and/or technology characteristics are indicated in the table footnotes and are not tested in production. Based on characterization, the minimum and maximum values refer to sample tests and represent the mean value plus or minus three times the standard deviation (mean±3S).

копировать двоичный файл памяти защищенного микрокомпьютера stm32f103cb

копировать двоичный файл памяти защищенного микрокомпьютера stm32f103cb

Unless otherwise specified, typical data are based on TA = 25 °C, VDD = 3.3 V (for the 2 V £ VDD £ 3.6 V voltage range). They are given only as design guidelines and are not tested.