I can get past this statement “ a bootable device has not been detected” I check and see others have had a similar issue. This is as far as I have been able to go. What do I need to do to complete this portion of the set
Did you adjust the BIOS settings as per Roon installation guide?
Also, check if your USB stick is seen as bootable device on other computer. Stick may be broken or may not be bootable.