BIOS Setting to boot USB UEFI stick

I should have elaborated more - It is possible to have a bootable UEFI stick with GPT - but I'm having problems with Dell's that have received recent BIOS updates listing the file system.  These enumerate with "PMAP" when you do an f12 at boot.  I think the update made a change so that it requires you to use fat32 so that it can read the efi - if the partition where the efi is located is on gpt it's not reading like it used to.  Like I said - used to work and now suddenly doesn't after firmware updates but still works on other systems...  This was on a stick that was created by acronis imaging - I made a backup of the stick, then used diskpart to clean, partition, and format with fat32.  After marking the partition as active and copying the files back down (Files over 4gb need to be spanned or enumerated on a separate partition) it worked as it used to.  When partitioning you can probably mark the system partition as fat32 and then just save your images or whatever to another partition.  You would need to use DISM if you want windows install files over 4gb on the primary partition by spanning them - I think the original post was about Linux or something... I would probably just boot a live stick and install ubuntu over the internet.