Flash Firmware

So I have these two GL-AR150 Smart Routers that I got from tinyhardwarefirewall (THF). They flashed some sort of firmware onto the devices to support their build and now I want to recover the hardware back to the GLI firmware. The THF support is not helpful. They sent me to GLI (which is where I started at to begin with). I downloaded the latest .bin file from GLI and tried using the THF GUI upload but it gives me an error.

Anyone have any ideas on how to recover the hardware?

You can use uboot.

That completely and totally worked. I never scrolled to the end of that page. Thank you.