All Xiaomi Phone QCN Backup Files

QCN = Qualcomm Calibration Network

Basically QCN file built in in all latest android mobile phone. QCN is the main and sensitive file of network, hidden in the deepest core of mobile phone internal memory file system (in efs folder, where all information of imei and baseband are saved). Also there are values such as IMEI and MEID number, network calibration values.

If the network is not running or it does not switch 2G-3G-Lte there is an error in this file.

In additional info, the QCN file does not contain Wi-Fi and MAC values.