To achieve Android 7.1.2, you must use unofficial community builds:
Conclusion Oppo F1s firmware 712 can “work” if the firmware matches your exact model and region, you follow correct flashing procedures, and you prepare properly (backups, drivers, battery). The main obstacles are compatibility mismatches and user error during flashing; both can lead to serious issues including bricking and data loss. For most users, using the official update path or professional support offers the safest route. If you choose to proceed yourself, verify model and firmware match, use verified sources, and follow step-by-step flashing instructions carefully. oppo f1s firmware download 712 work
Yes, but you must use the “Format All + Download” option. Warning: This will wipe your IMEI numbers. Back up NVRAM first using MTK Droid Tools. To achieve Android 7