The "serial not match" error on MTK chips is an illusion. The bootloader is actually checking only one bit: 0x4A in the SECCFG partition.
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). The "serial not match" error on MTK chips is an illusion
If you attempt to enter Fastboot mode (usually by holding Volume Down + Power ) to unlock the bootloader without official approval from Oppo, the system triggers this security fail to prevent unauthorized software modifications. The "serial not match" error on MTK chips is an illusion