Flashing your device voids the warranty and carries inherent risks. The author and website are not responsible for IMEI loss, bootloader corruption, or hardware damage resulting from following this guide. Proceed at your own risk.
A: For newer CPH1803 units with Android 10/11 bootloader, OPPO introduced Secure Boot. You must load the provided authentication file ( .auth ) into SP Flash Tool, or the flash will fail with a security error. oppo a3s cph1803 flash file