Oppo secures its MediaTek bootloaders. You may need an MTK Auth Bypass tool to temporarily disable bootloader security before SP Flash Tool can write data.
The phone won't update to the latest ColorOS version.
Often, refurbished devices have their software wiped and reinstalled to ensure a clean slate. Sometimes, this process might not be done correctly, leading to issues like OTA (Over-the-Air) update failures. Why Would You Need to Re-flash If you bought a refurbished , you might face scenarios requiring a firmware fix:
This comprehensive guide covers everything you need to know about Oppo A78 refurbished firmware, including how to identify your model, where to find official flash files, and how to safely install them. Understanding Oppo A78 Variants