When installing Window 10 clean via ISO, make sure you have OTG adapters and USB keyboard/Mouse ready.
During OOTB experience, you must have USB keyboard to key in Microsoft Account information.
Then install drivers from Notebooks & Ultrabooks | ASUS Transformer Book T100 Chi | ASUS Global
Starting from the Chipset 1st then to the others. BIOS and Bluetooth can skip. Install ATK first before Touchpad.
Everything works.