You might be able to drop the manufacturer’s keys somehow[1] but I would not recommend.
If you still really want to do this, I would advise you to:
Unsolder the eeprom
Solder a slot-in socket instead
Get a new blank chip
Get an eeprom programmer
Dump the eeprom to a bin file
Flash that bin file onto the new eeprom
Test that the motherboard POSTs
Search for cryptographic signatures (possibly compressed, possibly obfuscated - rolling XOR, reversed, etc) in the bin file
Hack around that bin file trying to blank the keys, or better yet, replace them with yours.
Go to step 7, repeat.
Of course, you could always flash the modified bin onto the new eeprom directly at step 6, but what’s the fun in that? 😅
Also, if you really do this(!), please don’t forget to document. 🙏
I doubt they went as far as “fusing” them in the factory, it would be perceived as “overkill” for a general public product - which I assume it is - and would run the risk of bricking upgradibility of the board, should the manufacturer lose the keys. Plus, it doesn’t help anything (quite the contrary) if the keys are somehow leaked by the manufacturer. ↩︎
Welp. My skills end at #1. So I guess I’m SOL 😂 Thanks for this though! I like knowing that it’s possible, even if it’s outside of my current ability 🙂
Well, technically, if you can do #1, you can probably do #2… 😋
And then the rest doesn’t require advanced skills, with the exceptions of point #8. Using a programmer is essentially the same as with any other tool. There is a method, you follow it, and you never, ever get close to the blade with your hands when the machine is running. Oh, no, wait, that is for a different tool. 🙃
For sure haha I meant I don’t have soldering skills. I know there’s a hardware BIOS programmer device I could get, but I feel like at that point, I may as well get a new motherboard 👀
If you’re getting a new motherboard anyway you might as well give it a go. There are some micro soldering training kits you can pick up for ~£15 to practice.
I’m running up against the wall of breaking the signature. I guess my motherboard protects itself from unsigned modifications and idiot tinkerers 😂
You might be able to drop the manufacturer’s keys somehow[1] but I would not recommend.
If you still really want to do this, I would advise you to:
Of course, you could always flash the modified bin onto the new eeprom directly at step 6, but what’s the fun in that? 😅
Also, if you really do this(!), please don’t forget to document. 🙏
I doubt they went as far as “fusing” them in the factory, it would be perceived as “overkill” for a general public product - which I assume it is - and would run the risk of bricking upgradibility of the board, should the manufacturer lose the keys. Plus, it doesn’t help anything (quite the contrary) if the keys are somehow leaked by the manufacturer. ↩︎
Welp. My skills end at #1. So I guess I’m SOL 😂 Thanks for this though! I like knowing that it’s possible, even if it’s outside of my current ability 🙂
Well, technically, if you can do #1, you can probably do #2… 😋
And then the rest doesn’t require advanced skills, with the exceptions of point #8. Using a programmer is essentially the same as with any other tool. There is a method, you follow it, and you never, ever get close to the blade with your hands when the machine is running. Oh, no, wait, that is for a different tool. 🙃
For sure haha I meant I don’t have soldering skills. I know there’s a hardware BIOS programmer device I could get, but I feel like at that point, I may as well get a new motherboard 👀
If you’re getting a new motherboard anyway you might as well give it a go. There are some micro soldering training kits you can pick up for ~£15 to practice.