Well the good news is that if you need to then there are only approximately 1.7 million combinations for an alphanumeric password since it's 4 characters long.
That's opposed to about 2.8 trillion combinations for an alphanumeric password that is 8 characters long. Like the BIOS password I put on my laptop.
Hmmmm.... 2.8 trillion... I hope I don't forget my password.