Guide:
If a phone is connected to a Google account, remove the account , otherwise adb command won’t let you reset the owner of the phone. Or factory reset the phone
Connect the phone to USB to a PC with Linux or Windows
Enable ADB in Phone’s developer settings.
If Linux, install adb: sudo apt install adb
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Make sure the command adb devices shows your phone
Make sure you can run commands e.g. adb shell id
. During 1st attempt it will ask for ADB authorization on the phone, confirm it.
Grant permission to Proxysmart app (one line):
adb shell dpm set-device-owner com.allproxiessofts.proxysmart/.receivers.MyDeviceAdminReceiver
adb shell dpm list-owners
1 owner:
User 0: dmin=com.allproxiessofts.proxysmart/.receivers.MyDeviceAdminReceiver,DeviceOwner,Affiliated