The Oppo S39 was already an older MP4 player when the original post was written, but it still made sense as a dedicated video and music device that did not drain the phone battery.

What you need

  • The `S39_10.b08.img` ROM file
  • The `RK28Upgrade` flashing utility for Windows
  • A full backup if moving from a 9.x ROM to 10.x
Oppo S39 software update utility
The RK28Upgrade utility used to load and flash the ROM.

Update process

  1. Run `RK28Upgrade` as administrator
  2. Connect the Oppo S39 to the PC while it shows the USB icon
  3. Load the ROM using button `1`
  4. Press `Switch` using button `2`
  5. When Windows asks for drivers, point it to the `Driver` folder in the RK28Upgrade directory
  6. Once the device is shown as connected, press `Update` using button `3`
  7. Wait for the process to complete and accept the formatting prompt
  8. After reboot, change language from settings if needed
The key warning from the original post still stands: when crossing from ROM 9.x to 10.x, back up everything first because the internal storage will be formatted.
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