androidrbox

That's the memory address of the flash controller. I got it from the Linux device tree.

It might be called sdio or mmc or something like that. I don't have the firetv2 hooked up right now, so i'm referencing the fire stick 4k, but it seems...

Sorry, I forgot to reply. I would recommend completely removing modemmanager to ensure it's not causing any problems. As for the whole process not working. If you're bootloader doesn't have...