I'm not sure much further progress will be possible at the moment, because things have taken a turn for the worse. The pain in my hands and the confusion is so bad that physical limitations will prohibit complex physical and mental tasks. I'm switching to voice input.
I haven't tried to reflash the WAP, it's just got its knickers into a twist over modifications to startup / config files I think. One looks a bit like initial shell scripts in a language of their own, CLi stuff, acts a bit like autoexec.bat (dates me), and iirc I was trying to copy a file from one WAP to another and get it to either overwrite the existing file on the second WAP, or to re-point it to use a second alternative file with a new name. Can't precisely remember, as it was a while ago.
So I'm wondering if some procedure of poking a weapon into some hole might be good enough as on some devices you can do a “restore to factory settings” kind of thing.