surface pro 2 Surface 2 BIOS/UEFI not showing
Surface Pro 2 comes with Windows 8.1 Pro.
Windows RT is only on the Surface 1 an 2, not on the Pro version.
If you mean that you'll have Surface 2 (non-Pro), than you can't switch from Windows RT to normal Windows. Normal Windows does not support ARM based CPUs.
Back in the day, maybe still true today, I don't know for sure, but UEFI is picky.
UEFI likes only FAT32 formatted drive, and in the case of the Surface Pro 2, the magic drive size that it is happy with is 8GB, like many other systems. Why it is picky like this, I don't know. When I had to recover my Surface Pro 2, or other UEFI based laptops, I had to take my external HDD, make a 8Gb partition, and extract the ISO in there, and make it bootable.
The easiest thing you can do, is just upgrade from Windows 8.1 to Windows 10.

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