Bios Mods -The Best BIOS Update and Modification Source

i need unlocked hp dv4 1504tu.

Here is some info on the laptop and bios:
-Motherboard Manufacturer and Model : HP Pavilion dv4 1504tu
-Bios Revision : F.67
-Bios Type : Insyde
-Bios SLIC : 2.0
-Bios Download Link : From HP Site: http://ftp.hp.com/pub/softpaq/sp51001-51500/sp51483.exe
-RW-Everything: http://www.mediafire.com/?usslriq0y4bdsmn
thanks!

My HP Dv4 1120us uses the same version of Bios (F.67). What kind of benefits I get unlocking the Bios?