Copy MCU Firmware in the format of binary or heximal, and copy the code to new Microcontroller, the status of Microprocessor will be reset to unlocked one;

Most MCU microcontrollers on the market have a security fuse (or multiple fuses) that control access to the information stored in on-chip memory. These fuses could be implemented in software or in hardware.

Software implementation means that a password is stored in the memory or a certain memory location is assigned as a security fuse. For example, in the Motorola MC68HC908 family, password protection is used, and in the Motorola MC68HC705B family, the security fuse is located in the first byte of the data EEPROM memory.

Both variants have relatively high security, because it is extremely difficult to find the physical location of the fuse or password and reset them. At the same time, people want to copy IC program can try using glitch to override the security check subroutine, or use power analysis to see whether a password guess is correct or not.