Infineon XMC4000 industrial MCU uses flash protection. XMC4000 decryption unlocks it to recover firmware.

XMC4000 Protection:
- Flash protection settings block readout.
- Debug interface can be locked via HSE.
- Firmware cannot be read after protection.
- OTP and user configuration are secured.

XMC4000 Decryption Methods:
1. Voltage Glitching: glitch VDD during protection check.
2. Clock Glitching: fault debug controller.
3. Decapsulation: read silicon die directly.
4. Side-Channel: power analysis during access.

XMC4000 is used in industrial drives, PLCs, and motor control.