Your box has 2g8g and gigabyte lan for sure?
Try one of Demetris's builds. S802/S812-Libreelec images for 7/8/x
Open the download link under - S8X2 LE-8.0.1 & LE-8.0.2 & LE-8.2 images
In the image section look for the MXIII_Plus image for 8.2.2. and download (8.2.3 did not install properly form me and others). Then go to Demetris's forum and post 1519 and 1504. 1519 shows how to change the Android image to 115K4, which allows booting from SD. 1504 shows how to install from SD card. Read page 1 the fourth line and you will see download link for 115K4.
Unzip it and copy it to /storage/.update/
With the image you want to flash
Or login to box with ssh prior to flash and issue this command:
# touch /storage/.update/.nocompat
Do I have to revert back to android first? What do you mean 115K4? s805-autoscript?