I just had a similar problem, and after 2+ hours chatting with Solo tech support there was no resolution other that "Find another GoPro" or get GoPro tech support to help you reset to factory defaults. "But we can't do anything till the GoPro is eliminated."
Well not having access to another GoPro I started digging through the logs... no reference to GoPRo.
I then looked at /usr/bin/GoProManager.py and found that it looked at /etc/shotmanager.conf for GoProEnabled=1.
Well mine was GoProEnabled=0
I set it back to 1 in /mnt/rootfs.rw/etc/shotmanager.conf restarted the Solo and Camerasettings were all available as well as the record button was now red.
So this might be your problem, and it might not, but it's a simple fix and easy to check out.
...ken...