Given the technical nature of IMEI repairs and the risks involved, if you're not experienced with such procedures, it's highly recommended to seek help from a professional technician or contact Oppo's customer support for guidance.
to rewrite the original IMEI back to the device's partition. Stock Firmware Flashing oppo cph1937 imei repair
For severe IMEI loss where the NVRAM partition is corrupted (showing "Invalid IMEI" with an exclamation mark on network bars). Given the technical nature of IMEI repairs and