What should I do if the cisco R3745 router forgets the password?

Today a colleague asked me what to do if I forgot the password of the cisco R3745 router. In fact, the solution is very simple, just a few operations. Console Go up.
Ctrl+Break
confreg 0x2142
reset 

Then don't go in.
show start is configuration.



Then restart,
Ctrl+Break
confreg 0x2102
reset
It's restored