It reported b02, I tried installing b02 to b05 delta the night when things went wrong and it didn't like it as I was on SVN 12 which there isn't that sub version on B02, things had gone wrong and I don't know where.
Anyway because it had a long power off, rather than short resets, that seemed enough for me to then flash b02 to b05. Long story short I then got to b11 modem, nand erase and restore root_uImage via tftp to Nordic, then framework to run Nordic to Nordic which reset everything to b02, then because it's all now sync'd I was able to extract the password and get back to b12 on router and modem via fota.
I am grateful for everyone's help, the help here is amazing thanks!