How do I boot the USB in efi mode? Sorry, this all a bit technical!!
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What about the EasyBCD program on the usb? Would that do the trick?
Easybcd doesnt work well across modes.
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When you select to boot your pc from usb stick, you should have two options.
One is efi mode
the other is bios mode.
they will say something like
lexar jumpdrive 1.0
and
UEFI: lexar jumdrive 1.0 partition 1
or it might say
lexar jumdrive jumpdrive 1.0
and
windows boot manager lexar jumpdrive 1.0
the descriptions will be slightly different depending on your bios/firmware, but there should be two obviously different entries.
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Are you using the one time boot menu to select your usb stick?
There will be a key to press at post to bring up the onetime menu, on my machine it is F12, on HP machines it is usually F9.
Usually tap the F key immediately after the beep , or just startup the machine and keep tapping the key until it pops up