If you factory reset a phone and do not know the previous Google account credentials, the phone will lock. Technicians often download a specific version of Google Account Manager (usually version 6.0.1 or similar for older Androids) to access the phone's settings during setup.
Because "Google Account Manager" is most commonly searched in the context of , this guide focuses primarily on that system application.
⚠️ Google Account Manager unless you want to break all Google services on the device.
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