If you are stuck in this loop or cannot enter fastboot, try the following community-recommended methods:
Submit an application and wait for the "Approved" status (usually takes 1-2 hours or up to several days). the serial is not match fastboot unlock verify fail oppo
Ensure you are using the latest Google USB Drivers or the OPPO Preloader Drivers . Check your Device Manager to ensure the phone is listed as "Android Bootloader Interface" without a yellow exclamation mark. If you are stuck in this loop or
, a specialized tool for phones with Mediatek processors that can bypass these serial verification hurdles entirely. Hard Reset Rescue : In a pinch, holding the Power and Volume Down , a specialized tool for phones with Mediatek
and tech forums, Alex found a trail of digital breadcrumbs left by others who had faced the same "serial mismatch". The Path to a Fix
The serial mismatch is Oppo’s digital bouncer. It checks your ID (serial number) against the guest list (Deep Testing approval). You cannot bribe it. You cannot sneak past it. The only way through is to apply for the official unlock token.