I've been trying to convert my Whizz from Android TV to libreelec.

Not luck so far, but if anybody has done it and would like to share, that would be appreciated.

I've built several USB keys and SD cards with libreelec, but I can't seem to get them to overwrite the Android boot loader/bios.

It doesn't matter what port I plug it in to, I can get in to the bootloader (by pressing the button on the side when turning on), but that's about as far as I can get.