I cant seem to boot into USB using Ctrl+U I have dev enabled and USB booting enabled:< (I'm new)

I cant seem to boot into USB using Ctrl+U I have dev enabled and USB booting enabled:< (I’m new) I dont know why it isn’t working!

did u read the docs?

ya i tried using mrchromeboxs script(usnporrted device i have a a ARM based cpu)
i also tried crouton and enabling dev (booting crossystem)

what guide are you following?