Restore connectivity on smartphones with corrupted NVRAM/QCN data.
Have you successfully used the IMEI QCN Tool? Share your experience in the comments below (if applicable). Imei Qcn Tool Download
While downloading these tools can be a lifesaver for legitimate repairs, there are two major things to keep in mind: [GUIDE] How to change IMEI on Snapdragon devices While downloading these tools can be a lifesaver
Replace the placeholder text with your and IMEI 2 . Click Rebuild or Convert to save the personalized QCN file. Step 3: Wipe Corrupted EFS Data You must open the phone's diagnostic port
QCN tools cannot communicate with a phone via standard MTP or ADB modes. You must open the phone's diagnostic port. This is usually achieved by entering a secret dialer code (e.g., *#*#717717#*#* on Xiaomi devices) or executing the ADB command adb shell su -c "setprop sys.usb.config diag,adb" on a rooted phone.
A QCN file is a sensitive system file found in the internal memory of Qualcomm-based smartphones (specifically in the EFS folder). It stores vital information, including: