Solved: Can’t type changing boot mode code – HP Support Community

When you selected the USB flash drive that should have been listed along with the EFI file.

If there is no USB flash drive option to select, then you need to go into the F10 setup menu and disable secure boot.

Save the settings, go back to the F9 boot options menu and you should see a legacy boot options list and an EFI boot options list.

Select the EFI USB flash drive boot option and press the enter key.

After you get W10 to reinstall, you can go back into the BIOS and enable the secure boot setting again.