If you see an [OppoNVrecovery] error after flashing, you may need to use a dedicated NV backup file or attempt a fix with MSM Tool .
Connect the device to the PC via a USB cable. The PC should recognize it as under Device Manager. oppo cph1701 flash file umt
Open the UMT QCFire module on your computer. Load Firmware: Go to the Flash tab. If you see an [OppoNVrecovery] error after flashing,