HD Locked after bios Update

I recently bought a used hp probook 6555b from a friend of a friend who is now of course no where to be found. Within a few weeks it started randomly blue screening and rebooting. Someone suggested i try upgrading the bios but none of the pw's he gave me when i bought it worked so it locked. I have been able to hook the "locked' drive up as a secondary drive on my pc and pull most of the files that mattered but was not able to boot to it directly . I have been told i need to purchase a new unlocked bios chip to replace the existing one. I was oddly able to put another old drive into the 6555b with the same bios chip and it booted up ok and was functional.. so now i'm a bit confused and just wanting to get a second opinion and a bit more understanding before I do anything else. If I replace the bios chip I'm assuming that won't entirely resolve the issue. Is reformatting the "locked" drive and doing a clean windows install my best option?
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More about locked bios update
  1. I'm not sure how that is done but these links may be helpful. The second link is to the user manual for that computer.
    http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&docname=c00034791#N360
    http://www.manualowl.com/m/Hewlett-Packard/ProBook-6555b/Manual/119160
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