Alternatively, use ADB commands: adb shell setprop sys.usb.config diag,adb . Step 2: Connect to PC
Click on the "Refresh" or "Detect" button within the tool. Ensure the COM Port matches the Qualcomm Diagnostic Port number shown in your Windows Device Manager. Step 3: Backup Original QCN (Highly Recommended) Download Imei Qcn Tool V1.0 UPD
| Risk | Consequence | |------|--------------| | | Many “IMEI tools” on forums contain keyloggers or ransomware. | | Wrong QCN file | Permanent signal loss, corrupt EFS partition beyond recovery. | | IMEI mismatch | Network rejects device completely (IMEI blacklist conflict). | | No backup | If the tool corrupts your EFS, even a service center may fail to fix. | Alternatively, use ADB commands: adb shell setprop sys