Unable to activate USB debugging after upgrading to Android 5.1.1

Question

After upgrading my Huawei phone (which is rooted) to Android 5.1.1 (CM 12.1) the 'USB debugging' option is greyed out with message:




'Device is in charging mode, USB debugging is disabled'.




The message is present even when the cable is not connected.



I have already tried following solutions (but the USB debugging is still greyed out):




Restarting the phone

Disabling developer mode and enabling again

Disabling developer mode, restarting the phone and enabling it again

Removing the cable and trying all above solutions



— Alam | Sources

Answer

Removing 'persist.system.usb.config' file from data/property/ folder and restarting the device solved the issue for me.

After restart, the device shows the option to enable 'USB debugging'.




Root access is required to remove that file.



— Alam | Sources

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