(A1601) officially reached Android 6.0 Marshmallow (ColorOS 3.0) as its final stable update. There is no official Android 7.1.2 Nougat firmware for this device. OPPO India Community If you are looking for Android 7.1.2, you must use an unofficial Custom ROM (such as LineageOS or Resurrection Remix). 1. Official Update (Maximum Android 6.0)
Various "Pure Android" builds exist on developer forums like XDA-Developers. Installation Prerequisites Oppo F1s Firmware Download 7-1-2
The Oppo F1s remains a capable secondary device, but its hardware (MediaTek MT6755, 3GB/4GB RAM) runs Android 7.1.2 smoothly. If you are a tech enthusiast comfortable with TWRP, risk of minor bugs, and want modern features like multi-window, then yes—download a LineageOS 14.1 build from XDA. (A1601) officially reached Android 6
At least 60% charge to prevent the device from shutting down during the flash. If you are a tech enthusiast comfortable with