While some third-party sites may claim to offer an "Android 7.1.2 update," these are usually unofficial custom ROMs or potentially unsafe files. Installing them often requires unlocking the bootloader, which is typically restricted on Oppo devices. Official Update Method
You can check for official stock firmware for the F1s (Model A1601) on specialized archives like HardReset.info OPPO Support Page OPPO India Community Downloading & Installing Android 7.1.2 (Unofficial) Oppo F1s Firmware Download 7-1-2
: You can download the latest official F1s firmware (Version No: A1601EX_11_A.36_180813 , 1.27 GB) from the official support portal. Visit the OPPO support website, select your region, navigate to "Software Update," and choose the "F1s" model to begin the download. While some third-party sites may claim to offer
If the update fails and the phone stuck in a bootloop, you may need to enter Recovery Mode (Power + Volume Down) and perform a "Wipe Data/Cache". Visit the OPPO support website, select your region,