Hello. Yesterday I got my G5 but spent hours in frustration trying to get this thing to boot from USB drive. No matter what I use (Rufus, Windows Media Creation Tool), UEFI/CSM, GPT/MBR, Windows 10 or Ubuntu, it just does not show up in boot menu and when I manually pick USB it just says error and reboots. I haven't found anything for it because G5s are new and looking on forums for older models did not help.