. If you want to factory reset your device but don't remember your password, you can do the following:
Reset your Google password.
Remove the Google account before you reset your device.
3. If you've reset your Android device and didn't remember your Google account name and /or password, do the following:
If you only know your Google account username, then reset your password. It may take 24 hours for the new password to sync with all your registered devices, then verify Google account using the new password.
f you have multiple Google account and can't remember which of them you're using on the device, then log on to Android Device Manager using each of the accounts details to check if the device is listed in the account.
If you can't remember the Google account username, you can send the device to an authorized Android device center with proof of purchase. They will use a special tool and reopen the device.
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