We can Reverse Engineering Encrypted AVR Chip ATtiny261 Software, please view the AVR Chip ATtiny261 features for your reference:

The ATtiny261 is a low-power CMOS 8-bit encrypted AVR chip based on the AVR enhanced RISC architecture. By executing powerful instructions in a single clock cycle.
The ATtiny261 achieves throughputs approaching 1 MIPS per MHz allowing the system designer to optimize power consumption versus processing speed.
The AVR core combines a rich instruction set with 32 general purpose working registers. All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle before Reverse Engineering Encrypted AVR Chip ATtiny261 Software.
The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC encrypted AVR chips.
The ATtiny261 provides the following features: 2/4/8K byte of In-System Programmable Flash, 128/256/512 bytes EEPROM, 128/256/512 bytes SRAM, 6 general purpose I/O lines, 32 general purpose working registers, one 8-bit Timer/Counter with compare modes.
One 8-bit high speed Timer/Counter, Universal Serial Interface, Internal and External Interrupts, a 4-channel, 10-bit ADC, a programmable Watchdog Timer with internal Oscillator.
And three software selectable power saving modes. The Idle mode stops the CPU while allowing the SRAM, Timer/Counter, ADC, Analog Comparator, and Interrupt system to continue functioning before Reverse Engineering Encrypted AVR Chip ATtiny261 Software.
The Power-down mode saves the register contents, disabling all chip functions until the next Interrupt or Hardware Reset. The ADC Noise Reduction mode stops the CPU and all I/O modules except ADC, to minimize switching noise during ADC conversions.
The device is manufactured using Atmel’s high density non-volatile memory technology. The On-chip ISP Flash allows the Program memory to be re-programmed In-System through an SPI serial interface, by a conventional non-volatile memory programmer or by an On-chip boot code running on the AVR core when reverse engineering microcontroller.

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