Hallo, I had the same signal problem. I bought Xiaomi 14 at China and bring it back to Indonesia, apparently the signal was lost, can't register to network.
These last 2 months, i tried to turn.on anf off the flight mode, sometimes it works, and onceit works, it will have the issue on daily basis which can be solved by flight mode.
This time, already 2 days without signal. I tried the fix tool on tjis post, but not working due to its still locked. Below is the error message. Please help
fastboot: error: Command failed
Warning: skip copying modem_ab image avb footer (modem_ab partition size: 0, modem_ab image size: 131854336).
Sending 'modem_ab' (128764 KB) OKAY [ 4.383s]
Writing 'modem_ab' FAILED (remote: 'Flashing is not allowed in Lock State')
fastboot: error: Command failed
Warning: skip copying modemfirmware_ab image avb footer (modemfirmware_ab partition size: 0, modemfirmware_ab image size: 221663232).
Sending 'modemfirmware_ab' (216468 KB)