First download and install minimal ADB and fastboot tool here>>Minimal ADB and Fastboot
- Setup ADB and Fastboot on your PC.
- Enable Developer options & USB debugging on your Android device.
- Connect your device to the PC and open minimal adb and fastboot that you have installed earlier on the PC to pop out a command window
- On the command window, type the following commands one by one:
adb shell 'dd if=/dev/zero of=/dev/block/bootdevice/by-name/modemst1'adb shell 'dd if=/dev/zero of=/dev/block/bootdevice/by-name/modemst2'adb reboot
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