you will be Search the official link to download Oppo F3 CPH1609 Stock Firmware ROM (flash file) on your Computer. The firmware comes in a zip package, which contains Flash File, Flash Tool, Driver and How-to Manual.
Download Oppo F3 CPH1609 Stock Firmware (flash file)
File Name: Oppo_F3_CPH1609_MT6750_08082017.zip
File Size: 2 GB
How to Flash: Follow Tutorial
How to Flash
Step 1: Download and extract the Oppo F3 CPH1609 stock firmware on your computer.
Step 2: After extracting, you will get the Firmware File, Flash Tool, Driver and How-to Flash Guide.
Step 3: Install the USB Driver on your Computer (skip if drivers are already installed).
Step 4: Follow the How-to Flash Guide to Flash the Firmware on your Oppo F3 CPH1609 Device.
[*] Take a Backup: If you are going to flash the above Firmware on your Oppo F3 CPH1609 device, then take a backup of everything as because your personal data will be deleted after flashing the stock firmware.
[*] The firmware shared on this page is officially released by the company and helps you to recover your device if you ever got bootloop, software error, update error, hanging and dead issue.