Connect the phone to your PC via USB cable while holding the buttons.
If you need to restore your device to a stable state, you should use official stock ROMs. The original shipping OS. oppo f1s firmware download 712 work
There is no official 7.1.2 update . Any "7.1.2" firmware found online is likely a Custom ROM (like LineageOS) or an unofficial port. Connect the phone to your PC via USB
Open the SP Flash Tool folder and run flash_tool.exe as an administrator. oppo f1s firmware download 712 work
Purple turned to yellow. Downloading system.img. 10%... 30%... 70%... His laptop fan roared. The USB cable felt hot.