OK, I was able to fix using the "Unbricking/Unroot/Return to Stock LG Spirit 4G" guide.
However, the .cab file was incorrect from most sources and I had to D/L from the Torrent link.
Also, the last step of installing the .kdz file can take a very long time - up to an hour, so be patient.
I had been having problems with non-responsive apps that has been getting worse over the last month or so and today it failed to reboot.
After some hunting around, I found the "Unbricking/Unroot/Return to Stock LG Spirit 4G" guide. and my phone runs much faster and smoother although I will have to re-root, but that's easy.
Just happy to have a working device and apps that respond instead of giving me a dialog that says it has stopped responding.
Note that the .cab file is 680 MB, so if you D/L the MS87010a_05.S10a_05.P3032.cab file and it is something like 1kb, then you need to D/L from the Torrent.
I have the correct file but have no way to upload.
Mods, if you want, I can sent it to you and you can post it.
Thanks.