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#11
Windows built-in reset is extremely unreliable.
When you get into Windows, look in disk management. If you see an EFI System partition, then it is UEFI.
The likely reason you didn't boot into UEFI mode from the USB flash drive is because you didn't go through all the steps required to make Rufus create a flash drive compatible with UEFI - which happens A LOT!
You really only need UEFI if your drive is over 2TB in size or you want more than 4 primary partitions.