You can verify this by going to on your phone.
Hold Power + Volume Up for 20 seconds to force a restart. If that fails, use SP Flash Tool to reflash a working boot image. firmware oppo a78 4g
Sometimes a new update is worse than the old one. If you updated to ColorOS 14 on your A78 4G and regret it, you may want to downgrade to the previous stable Android 13 firmware. You can verify this by going to on your phone
Here is a curated list of the most useful technical documents and resources covering the Oppo A78 4G firmware and hardware: firmware oppo a78 4g