Why can't the POCO C71 be unlocked after upgrading?

After the POCO C71 undergoes an OTA (Over-The-Air) upgrade, the system requires approximately 15 minutes to complete the internal package merging process.
For your reference, here are more details of the issue:
1. During this critical period, if the device is forced into Fastboot mode in an attempt to unlock it, the ongoing merged data will be erased. This leads to the failure of the mirror check header file verification, ultimately causing the device to crash and become unresponsive. Once this issue occurs, the phone cannot be recovered through normal operations;
2. The only solution is to re-flash the device using Fastboot mode to restore it to normal working condition;
3. Therefore, it is strongly recommended not to unlock the device immediately after an OTA update, and to wait until the package merging process is fully completed.