The LG K40 has anti-theft and may affect how you are able to master reset the device.
To turn anti-theft off, you must remove any Google and Gmail accounts assigned to the device.
- From your apps list, tap Settings > General > Accounts.
- Tap the Google/Gmail email account assigned to the device.
- Tap Remove account > REMOVE ACCOUNT.
- Repeat for any remaining Google/Gmail accounts on the device.
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