Alternative to first method in this post, if Android is working. (I used this today to change Google owner registration)
Copied from https://www.hardreset99.com/chuwi-mobile/chuwi-hi12-hard-reset-factory-reset/
To perform a mobile factory data reset using the Settings menu from within Android, follow these steps:
- First , Open the Settings menu, On your mobile device.
- Then, Under “ Personal ” touch Backup & reset Option. You need to enter your PIN, pattern, or password.
- If you can not see Backup & Reset, try to find Reset option in your settings.
- Next, Under “Personal data,” touch Factory data reset.
- Next read the information on the screen and touch Reset phone option.
- If you have a screen lock, you will need to enter your PIN, pattern, or password.
- Then after, When prompted, touch Erase everything Option to erase or delete all data from your mobile device’s internal storage.
- Finally, When your device has finished formatting, select the option to reboot your device.
- Factory reset done on your mobile.
After reset, you will see the android Welcome screen just as you did when you turned the device on for the first time.
Use your Google account settings to “restore” installed applications from e.g. the ones installed on your same Google account phone/phablet/tablet. You can install all of them or deselect any.
