Unable to login after upgrade to 18.7

[ljm42]

I just upgraded from 18.1.13 to 18.7 (not sure why it didn't go to 18.7.1)

Now when I try to login as root via the web it says:
  Wrong username or password.
and root via the console:
  Login incorrect

Any thoughts on how I can get back in?

I do have a backup of the xml file

This is similar to this issue:
  https://forum.opnsense.org/index.php?topic=9529.0
except I have a hardware router and not a VM.

[ljm42]

OK I found this thread which looks promising:
  https://forum.opnsense.org/index.php?topic=9284.0

[ljm42]

Well, that was pretty painful.

Thank you @anon000 for posting the fix:
  https://forum.opnsense.org/index.php?topic=9284.msg42322#msg42322

This was a lot harder than it needed to be because I made some mistakes setting up the interfaces in the installer before resetting the password.  Seems like the "reset password" option should be available without having to make any other configuration changes.

The second problem was that I couldn't update from 18.7 to 18.7.1 due to a "package manager is not responding" error. The trick to fixing that was to "Prefer IPv4 over IPv6", thanks @pouakai!
  https://forum.opnsense.org/index.php?topic=9432.msg42741#msg42741