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Credits: 5€ [Donate] So I have two options here really. I can either crack the passcode on this macbook bios or I can just replace a chip on the motherboard. There isnt anything too important on there so I dont mind wiping all the files on it but I do want to get it working. I dont even care if it runs windows in the end.
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Credits: 9.89€ [Donate] Hardware hacking isn't that strong of an area of mine, but I can tell you how I would approach this problem to find a solution.
I would do initial research into how the bios password auth system works for that make and model of a macbook, find out if there is a default password, any known bypass methods, some older apple products for example old iphone lock screens can be bruteforced after using an exploit, I would recommend researching to see if something similar is possible. I'm guessing the chip you are considering replacing is the bios chip, makes sense, i have some experience working with thinkpad bios chips for firmware modifications, if you do go that route, make sure you research it and do the necessary prep work to make sure you don't brick it. Sorry, wish I had a better answer. Maybe if you know the previous owners identity, you could look them up on a site like dehashed and see if they are the type of person that uses the same password for everything, and maybe try that password. Its a long shot.
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Credits: 4.92€ [Donate] Try unplugging the CMOS battery in the laptop, leave it out for around 30 minutes, then put it back in. The BIOS (and the associated pw) should be reset