Hi Rick,  I now have a solution, and that is to use an earlier version of the IOS (16.06.08) as suggested elsewhere.  This version lets me login more than once and reconfigure.  I tried the password recovery procedure procedure but this only appears ...

I'm still having difficult with gaining access to a 4221 router. I have upgraded to IOS as directed above, and when booting for the first time I can get to privileged exec mode etc., but if I reboot I am challenged for a username and password.  When ...