Did you remember to properly set the Select Operating System parameter in BIOS Setup (Configuration scene)?
You should also verify that Secure Boot is disabled in BIOS Setup.
Hope this helps,
P.S. I believe that booting from microSD's is not supported; you must use a USB flash disk for O/S installation. Rufus is a good choice.
This message was posted on behalf of Intel Corporation
I am looking into your case, reviewing the information of the Intel® compute stick STK1A32SC I am noticing that the unit is compatible with Windows® 8.1 and 10, have you tried to install any of these Operating systems on the unit for testing porpuses?