Procedure

1) backup /efs/FactoryApp and /efs/imei
2) remove /efs/FactoryApp and /efs/imei
3) reboot
4) if device is rooted

Code:
adb shell su
adb shell echo -n ON > /efs/FactoryApp/keystr
adb shell echo -n ON > /efs/FactoryApp/factorymode
adb shell reboot


Other Solution No need rooted Devices

if device is not rooted, you have to have adb tool from android sdk, after installing sdk run SDK Manager (if it doesn't start, use sdk\tools\android insted) you have to select and...




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