: Restoring QCN files often requires the device to be in Diag Mode (Diagnostics Mode) and may involve a "QCN Edit" step to input your device's original IMEI numbers to avoid legal or network blacklisting issues.
If your "About Phone" section says "Baseband: Unknown", the modem is not loading firmware. This almost always resolves by flashing a tested QCN.
The process takes 30 seconds. Once done:
The file "" is a compressed archive containing a Qualcomm Calibration Network (QCN) file specifically for the 128GB variant of the Poco X4 Pro 5G . Core Purpose of the File
The device has been tested with QCN (Qualcomm's Chipset series), which implies that the phone's modem and connectivity features have been verified to work seamlessly.