From OpenPLi Wiki
How to flash the receiver...
Download a image from: https://openpli.org Unpack the ZIP file and place the content on a USB disk.
FLASHING THE RECEIVER.
- Power off the receiver
- Ensure no other USB devices are plugged into the receiver
- Insert the USB stick containing the image into the rear port.
- Power the receiver on.
- You will be prompted on your TV screen to press and hold down ‘OK’ button on your REMOTE to commence the flashing process. The flashing process will then commence and progress show on TV screen.
- If successful the receiver will reboot itself after the flashing process has completed.
- Remove USB stick that contains the image files.
Note: In order to load the image automagically, rename the file called "noforce" to "force"