Hi Reg,
The instructions were listed by forum member DMR.
Do a search for 'dmr' and 'linux' and I think you'll find it otherwise, I grabbed a copy but it's on my work PC so if I don't see it in the firmware section tomorrow, I'll stick a copy there. (You're 5 hours ahead of me)
Look here:
/g/nanovna-users/message/1508 Cheers
Larry