Prevention is better than cure. If your OnePlus 7T Pro is currently working fine, stop reading and back up your QCN immediately.
: Dialing *#06# shows no serial identification or "000000000".
This preserves everything QCN does plus additional modem artifacts.
Enter your original and IMEI 2 (found on your device's original packaging). oneplus 7t pro qcn file
The OnePlus 7T Pro remains a favorite among Android enthusiasts due to its clean software, notchless display, and powerful Snapdragon 855+ chipset. However, advanced tweaking, flashing incorrect firmware, or accidental partition wipes can lead to severe connectivity issues. If your device shows "No Service," an invalid IMEI, or a missing baseband, you likely need a to restore its network functionality.
If your network is corrupted, use the same tools to "Restore" your previously saved backup file.
Restoring a QCN file from another device will copy someone else’s IMEI, which is illegal in most countries. You must edit the QCN file to inject your original IMEI numbers (found on the phone’s retail box) before flashing. Prevention is better than cure
the phone. Check *#06# – IMEI should be back.
Click next to "QCN File" and select your edited, original-IMEI QCN file. Click the Start button.
(Crucial Step) Check the box that says if you are flashing a modified donor file. This preserves everything QCN does plus additional modem
Enable on your phone (Settings > About Phone > Tap 'Build Number' 7 times > Go back to Developer Options > Enable USB Debugging).
Before flashing, you must inject your original IMEI numbers into the downloaded QCN file. Download a tool like or a hex editor. Load the downloaded OnePlus 7T Pro QCN file into the tool.
Sporadic bars flickered at odd hours. Calls dropped only when she was near her favorite café. Mobile data throttled inexplicably, then surged like it had found a secret highway. Tech forums offered guesses: firmware oddities, carrier quirks. None fit. The symptoms felt…personal.
To communicate with the QPST tool, you must open the "Diag Port." Connect your phone to your PC via USB. Open a Terminal/Command Prompt on your PC. Type the following commands: adb shell su setprop sys.usb.config diag,adb 2. Back Up Your Existing Configuration