Classmate re-imaging problem

Hello i am current having some problems reimaging my teams E11 classmate. I followed the steps on the First technical resources. But every time I insert the usb with the reimaging software the Boot menu doesn’t recognize it. if someone could give me some advice that would be greatly appreciated.

Are you sure you clicked the “Copy OS Files after Format” Option in RMPrepUSB? I’d recommend redoing the image on the flash drive.

yes i did do that and i have reimaged multiple times