The is a lightweight, Windows-based application designed specifically for Qualcomm chipset devices. It allows users to write, back up, and restore QCN (Qualcomm Calibration Network) files.
Most Qualcomm phones can be put into Diag mode by dialling a special code. For Xiaomi/Redmi devices, common codes are *#*#717717#*#* or *#*#13491#*#* . After dialling, a menu appears – select “Diag” or “Qualcomm HS‑USB Diagnostics” and confirm. For other brands, the code may differ (e.g., *#*#33284#*#* on some Lenovo models). download link imei qcn tool v10