Yes, but Oppo enforces anti-rollback (ARB). Downgrading from ColorOS 13.1 to 12 may brick the device. You can only downgrade if the ARB index is the same or lower. Check ro.boot.anti in the build.prop.
Ahmed downloaded what he thought was the correct firmware for his Oppo A78 4G from a third-party website. He followed the instructions to flash the firmware using a tool called SP Flash Tool. However, the process failed, and his phone became unresponsive. firmware oppo a78 4g
Have you successfully flashed your Oppo A78 4G? Share your experience in the comments below. For more in-depth guides on MediaTek devices and ColorOS, subscribe to our newsletter. Yes, but Oppo enforces anti-rollback (ARB)