More **bleep** bios locked laptops!

I really hate this school.  The delightful children have somehow found the bios password and locked 3 (!) more laptops.

#1: HP 635 System disabled code 66213712

#2: HP 255 System disabled code 64774385 (this one has also been helpfully changed into kanji script of some kind!)

#3: HP 255 System disabled code 94311858

Any help will yet a-sodding-gain  be appreciated.

Ben