If your phone is stuck in a boot loop or won't turn on normally:
Warning: Links are provided for educational purposes. Ensure you have the correct model. Backup your data before proceeding. Oppo F1s Firmware Download 7-1-2
Below are the official file names and sizes for Android 7.1.2 firmware: If your phone is stuck in a boot
Note: Direct links change over time. Use a trusted site like “Oppofirmware.com” or “ROM.net” with caution. Alternatively, search for “Oppo F1s A1601 OTA Android 7.1.2” on XDA Developers. Confirm installation
This method works if your phone can still boot into ColorOS.