In the end I gave up and just burned a CD which worked like a charm.

Amigaharry2, appreciate the suggestion but missed it until after I had made the CD. Though I think this advice is worth flagging on the https://morphos-team.net/guide/usb-boot page for some G4 users.

It's been hard to find time to tinker with the little ones in the home office ...

And a thank you to everyone for the input, looking forward to spending some time with MorphOS

[ Edited by khawkins98 29.01.2021 - 10:03 ]