The term "Oppo Exclusive" in this error message refers to the fact that Oppo uses a proprietary RSA key verification system. While brands like Google or OnePlus use a generic Fastboot protocol, Oppo's bootloader expects a signed "challenge" from their own servers.
For 90% of Oppo users, the only way to bypass the "serial not match" error is to go through the official channels. The term "Oppo Exclusive" in this error message
Sometimes the error is a communication glitch between your PC and the phone. Ensure you are using the . The term "Oppo Exclusive" in this error message