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Make sure your Rescue Media was built using WinRE or WinPE 4 or above. The version is indicated at the top of the Rescue Media Builder interface. In that case, you do not need to switch from UEFI to Legacy, nor should you. Same goes for mucking around with the boot order Set the system back to UEFI with Secure Boot enabled, then use the F12 one-time boot menu to manually select your flash drive as the boot device. That will override the standard boot order just for that single boot event, saving you having to rearrange the boot order to just to boot from USB when temporarily needed, then go back and change it back later. If you don't see your flash drive listed in the F12 menu even though it was connected before you powered your system on, then maybe try another brand of flash drive. Also make sure you're actually using a flash drive, not a hard drive or SSD. Some systems don't support booting from USB "removable storage class" devices like most flash drives, and not "fixed disk class" devices like hard drives and SSDs.
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