New
#11
How about BIOS "Boot Device Priority?" It has the arrow pointing right which means the choices are hidden.
I'm sorry but I'm missing where you confirmed that you are booting the flash stick as a UEFI device? So we've not seen the Boot Priority choices showing this and I cannot find where you've answered this question yet.
You said that you used the flash stick on your friends PC but is that BIOS set to UEFI?