Believe it or not, a bad USB driver can cause this. If the fastboot protocol misreads the serial number due to a faulty android_winusb.inf file, it sends a blank string to the verification engine. The phone compares the blank string to the token and throws the error.
adb reboot bootloaderfastboot oem unlock. Instead, use:
fastboot flashing unlock
fastboot oppo unlock
Why this works: The Deep Testing app retrieves a signed unlock token specific to your serial number. When you use fastboot flashing unlock, the bootloader checks for this token. If you use generic commands, you get the "Oppo exclusive" error.
boot_a and boot_b partitions.fastboot flashing unlock, the modified bootloader will ignore the serial mismatch.Success rate: ~30%. This fails if Oppo uses RSA-2048 signature verification on the bootloader itself (most ColorOS 13+ devices do). Believe it or not, a bad USB driver can cause this
The specific phrase "The serial is not match" is the smoking gun. It implies a discrepancy between the data the device holds internally and the data expected by the verification authority (the unlock tool or server).
Here are the primary causes for this exclusive failure: Receive Approval: Once approved, the app will say
This is the most common cause. Many users attempt to use generic unlocking tools or cracked software meant for other Android devices. Oppo’s security requires a specific, often time-sensitive, encrypted token generated specifically for that device's Serial Number (SN). If you are using a tool that sends a generic unlock code, or if the tool cannot communicate with Oppo’s database to generate a signed token, the device rejects the command, flagging a "serial mismatch" because the expected return token does not match the device's request.
Why does the error say "serial is not match" specifically? Or for older models: fastboot oppo unlock
Your Oppo phone has two serial numbers:
When you flash a custom ROM or mess with fastboot oem unlock, the bootloader compares these two. If they differ (e.g., because you restored a QCN backup from a different phone), you get the mismatch error.
Solution for mismatch: Use fastboot oem get_identifier_token to see what serial your bootloader thinks you have. If it shows 00000000 or a scrambled value, your persist partition is corrupted. The only fix is an official service center reflash.