How to Reinstall Windows on a Tablet With no USB?

[lettuce]

I have just gotten approx 6 Windows RT 8.1 tables and need to reinstall windows 8.1 or 10 on them but these tablets do not have any USB ports just a micro SD card slot. How would one go about install a fresh windows installation on a tablet device that doesn't have a USB port, im unable to get into windows itself

Also how do you access the BIOS section on a Windows Tablet, as when you boot it asks to press DEL but as there no on screen keyboard im unable to do this!?

 

[lettuce]

Well this is the thing i have no idea what type/make of tablet it is, theres no logo or stickers on any of the devices (there all the same), they are black gloss on the front and white gloss on the rear.

Put Windows on a MicroSD card?
Andi.

http://www.intowindows.com/how-to-install-windows-78-1-from-your-phones-micro-sd-memory-card/

Yeah ive seen that already but i dont think its aimed at ARM systems, as the SD card i have windows rt on has a whole bunch of folders (which appear to be lang folders) and then 2 files...

bootmgr.efi
SurfaceRT.30.CONFIG.8.17.0.wim.mrk

Sadly i dont have a VT keyboard to hand

 

[lettuce]

Any other ideas?