@johnnb why would you scrap it? At least you could try a few more things. Try to reflash the BIOS. Turn it on by pressing the Power and Esc buttons at the same time. Get a BIOS Update from places [https://www.asus.com/supportonly/t100ta/helpdesk_bios/|like this] Insert the USB drive with the BIOS update on it while you do this. See if that updates your Asus.
Worst case scenario, get a pre programmed BIOS IC and replace your BIOS. Or you can try and find a working BIOS dump and reprogram your BIOS.
At least give it a try, instead of taking the easy way out, and continuing to feed the profit-before-planet machinery. Our landfills are full of devices that are being scrapped just because users are lost with the repairs.
Repair is War on Entropy!