Just reinstalling Kfmon by itself (a simple job) fixes 'Generator error' problem.
However, to get rid of annoying list of image files, I had to to run KoboRoot.tgz, which necessitated reinstalling Koreader/ Plato again anyway...
Okay, so...
The powershell method couldn't see my Kobo.
So I just extracted the contents of the KFMON zip
I got here into the root of the Kobo.
As expected: when I pulled the Kobo out of the PC, it restarted and 'updated'.
Aaaaaannnd......EVERYTHING WORKS AGAIN!
The menu is good - no errors!
Koreader and Plato both start!
EXCEPT...I can see that the eternal problem with all the image files (eg lots of PNG files) being listed again in my list of ebooks on the device has reccurred.
So I need to run the fix for this:
I put the 'KoboRoot.tgz' (
that I probably got from here) into the .kobo folder again.
I unplug, let it 'detect new books', and it goes thru an update process.
When it restarts, I hit "Full rescan" - which is a custom item I put on my Nickelmenu.
Now the image files are gone from my booklist!
HOWEVER, now Koreader and Plato both crash!
So I will have to reinstall them.
I just extract the zip of the
special combined package from here into the root of the Kobo...unplug...
It scans for new books but doesn't seem to restart and update....
But once its finished, everything is working!