I'd like to share how to reset a lost password on a Fortigate Unit.
1) start some terminal emulator and connect to the device using a a console cable. Depending on which device you use it will be a RJ-45 to Serial or Serial to Serial cable
2) Reboot the device and immediately it starts up login with user “maintainer” and password “bcpb%deviceserialnumber%” e.g. “bcpbFGT60C3G10014505″
(This should be done within 14 seconds. So ,it will be better if you type the password on a text editor and copy and paste it on the terminal console
3) change the user password as described below in command windows,
" config system admin
set password %password%
Put administrator username in the plac of %user%
Put password that you want to change in the place of %password%
OK. That's it. Now your Fortigate Unite Administrator Password has been resetted.
May you all be happy.
(Be knowledgeable, pass it on then)