It works on some models without all the fancy new fangled security stuff enabled (I'm writing this on a laptop I took apart for just that reason), but if you're out of luck there you're going to have to call Sony I'd imagine.
Its a seperae CMOS eeprom chip.. Generally 8 pin and looks like a Field effect transistor.. The only thing you can do is start looking up chip numbers on http://www.alldatasheet.com and see if you can find it. Problem is its a programmed component as well and a blank chip will not work. contact pwcrack.com for te correct chip, The cost is high 99.00 for the chip and the location, (Actual cost may be 1.00). But if you need it? you need it.
And here is the answer: the last IC i've mentioned, marked 402WP ST9508 located near the battery connector is the eeprom containing the password! It is a 24c02 eeprom. Just read it with a programmer and modify the dump to bypass the system password.
I suppose this is a forum to make poeple learn something & NOT to let poeple know that something has been done or can be done, because we know that it can be done & thats exactly why we are here posting in forums ... I believe any question in any forum has to be answered or forums would be a waste of time, & I hope that who ever has found a solution IN THIS forum or ANOTHER would post it with every possible detail, like for example you are telling us that you found the eeprom !! & then read it ... I personaly need more details like for example the location of the chip/eeprom on the motherboard, whats written on top of it, so that we can identify it if its a different sony vaio laptop, the method to read it, & what to change after reading it .. i mean this step by step procedure to unlock a sony vaio laptop with password lock. & this is the question for which this thread was created. I know that it might take you hours to explain this to us .... anyway its up to you if you wana give some of your time for free to help others out of bios obscurities.
quote :""" the last IC i've mentioned, marked 402WP ST9508 located near the battery connector is the eeprom containing the password! It is a 24c02 eeprom"""
question1: how did you find out that it was this chip the right one, there are many like that one on the mainboard???
question2: how could you find out that it was a 24c02 eeprom ?
quote: """Just read it with a programmer and modify the dump to bypass the system password"""
question3: how did you read it & then wrote to it ? well, I know about the analyzer.exe but i guess your experience would be a lot helpfull, since all the other forums lack someone like you, I mean someone who has really done it