Stock U8 Firmware: Blocks downgrades to U7/U6. Enforces strict RMM (Remote Mobile Management) locks.
The Problem: On stock U8, if you flash TWRP (Team Win Recovery Project), the phone will bootloop, display "Only official released binaries are allowed," or lock your OEM unlock for 7 days.
Download Smart Switch (PC/Mac) and connect your phone to check for firmware updates.
