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If the phone can’t be unlocked after an OTA update, please refer to the following details:
1. After an OTA update, the system requires around 15 minutes to complete the merging of the update package in the background;
2. During this critical process, if you enter fastboot mode in an attempt to unlock the phone, the system’s merged data will be erased or corrupted. This can lead to a verification failure of the mirror check header file, ultimately causing the device to crash or become unresponsive;
3. If this issue arises, the only way to restore the phone to normal operation is by flashing the firmware manually using fastboot mode.