TI TM4C123 (Tiva C, Stellaris) uses flash protection. TM4C decryption bypasses it to recover Cortex-M4 firmware.

TM4C Protection:
- Flash registers control read/write protection.
- Debug (SWD/JTAG) can be disabled.
- Commit lock permanently locks protection.
- Registers reset to locked state after boot.

TM4C Decryption Methods:
1. Voltage Glitching: glitch VDD during lock check.
2. Clock Glitching: fault flash controller.
3. Decapsulation: read silicon die directly.
4. Side-Channel: power analysis during access.

TM4C is widely used in industrial automation, robotics, and IoT gateways.