There are already too much blog posts around ? Most of them just talk about going onsite - using serial cable or "back door" user which are mostly disabled.
When the default password 'fibranne' for the root user did not help you, but you have still access to another switch in the fabric, this ist the way to push the password database from one switch you can access to the one you locked yourself out.
distribute -p PWD -d [#SwitchID]
#SwitchID is the decimal number in the first row in fabricshow output.
After this you can logon with the same password you know from switch A.
This is also a fine way to prevent to setup every password for admin, user, factory etc. by hand. Just setup one switch in the fabric properly and "push" the settings to each - or to configure fresh passwords FAST in a environment.
