PICO-TGU4 how to update bios?


I have a PICO-TGU4 board and i need to update the bios, so i created a usb key as described here https://forum.aaeon-community.com/discussion/39/update-bios-through-uefi-shell

but I doesn't work, it will not boot the uefi shell from the key and always come back to the bios settings...

But the key is recognized as uefi
What am i missing ?

Thank you.!

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