Unzip the file if you download it zipped
Install the DriverAssistant Windows Driver on your computer
Locate DriverInstall.exe under DriverAssistant_v4.5 directory
Run DriverInstall.exe
See diagram below
When finish, click OK
Locate AndroidTool.exe under AndroidTool_Release_v2.71 directory
Run AndroidTool.exe
Select Upgrade Firmware
Click "Firmware" to choose the .IMG file downloaded
Locate and select the latest IMG file, SDB801-10.0-HDMI-T-P20230817.img
The Firmware area will show the .img file you've chosen
Hold the Upgrade Key below and turn on the BDL3117P using the remote control
The AndroidTool SW will now show "Find one loader device"
Click Upgrade
Wait until Re-Image Complete
Done - you can now disconnect the USB A Cable
Install the SDM-L slot cover back onto BDL3117P