COMMON FIX

Bootloader locked from factory

Xiaomi factory bootloader lock requiring Mi account verification and 7-day waiting period

Affects: Xiaomi Mi Max 3

Mi Max 3 in fastboot mode showing DEVICE STATE LOCKED warning

Xiaomi locks the bootloader on every Mi Max 3 from the factory. To install custom ROMs, you must request an unlock from Xiaomi via their Mi Unlock tool, then wait 168 hours (7 days) before the unlock takes effect. This is a deliberate friction designed to deter casual modders.