Silicon Labs EFM32 Gecko Debug Lock Unlock: MCU Decryption
2026-09-26 17:00:00 | pcba-mkr
Silicon Labs EFM32 Gecko uses debug lock. EFM32 decryption unlocks it to recover firmware.
EFM32 Protection:
- Debug access via SWD/ISP can be locked.
- Device information page can be protected.
- Lock bits prevent flash readout.
- Mass erase resets lock but erases flash.
EFM32 Decryption Methods:
1. Voltage Glitching: glitch VDD during lock check.
2. Clock Glitching: fault debug controller.
3. Decapsulation: read silicon die.
4. Side-Channel: power analysis.
EFM32 is used in low-power IoT, wearables, and sensor hubs.
