If you are looking for an alternative, there are third-party websites that host what they claim are official "Stock ROMs" or "Flash Files" for the Oppo F3. These are the original firmwares designed to restore the phone to its factory software state. This is sometimes necessary for "unbricking" a device or fixing software issues like boot loops and password locks.

If an update is available, you'll see the version details and changes. Tap Download and Install

This guide provides the necessary information, files, and step-by-step instructions to safely download and install an Android 8-based custom ROM on your Oppo F3. ⚠️ Critical Prerequisites and Risks

If you are determined to run Android 8 on your device, your only option is to flash a . This is an unofficial operating system built by independent developers. Popular Custom ROMs LineageOS 15 (Based on Android 8) Pixel Experience (Based on Android 8) 🛑 Risks of Custom ROMs

Your phone will restart to complete the installation