Hi os2sam
Thank you. I should have mentioned that I had re-copied the code you state above and from page 28 of this thread but it doesn't work. The Pi3B+ stays stuck on the boot screen. After some research and multiple attempts, it does now boot with the following:
dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait splash plymouth.ignore-serial-consoles usbhid.mousepoll=0 slub_debug=FP
The only difference from the above post (and page 28) is I have root=/dev/mmcblk0p2 and you specify root=/dev/mmcblk0p7 (7 at the end of your suggestion). I've also added the wireless mouse stability line which worked a treat. Is this an issue going forward by having '2' instead of '7'? I followed the excellent guide on page 28 and installed cgminer but can't test with the R606 or Newpac's for another 24hrs or so. I have run the .sh file from the cgminer folder but get a url message after 20 seconds or so. Is this normal to see as I was expecting the standard cgminer dashboard to load with no recognised miners?
Thanks for all the help so far.
Hi
I've tried the instructions on page 28 time and time again and it just wont fire up cgminer 4.11.1 with any newpacs or the r606. I get the date/time stamp and message "Started cgminer 4.11.1" then it freezes for approx 30 secs before saying its either the server, URL, check details or set up workers. It then cycles between Pool 0 difficulty changed to 10000 and Pool 0 message: Failed auth

I've ordered a Pi4 but about to throw this Pi3B+ under a bus...what can I do next? Please see above post where the Pi3B+ won't boot up with the command line given on page 28. Is that the difference or what else can it be?
Thanks in advance and regards.