RSA signed BIOS modding -- what are the risks?

[steadyflow69]

There is some error checking when your computer first starts up to see if the digital signature on the bios is correct. If this fails then your computer will fail to boot and appear bricked. You can still recover it without any problems.

You have to figure out the algorithm they use to sign the bios in order to get it to work, but RSA algorithms are pretty secure.

Thanks for your reply, Donovan.

So the digital signature check may end up using a variety of factors, including the file size and some kind of checksum?  Would a relatively minor change be small enough not to be detectable?

I'm just curious why I don't see something stated in the guides/directions like "Forget about the RSA signed BIOS -- it cannot be altered in any way".  All HP laptops made from 2011 on have an RSA signed BIOS so all of these requests for HP dv6/dv7 laptops should end up denied, right?  But I do see people submit them and quite a number report back success.  Do the programmers who provide these mods understand the RSA algorithms and find a way to defeat them?

It can be modded. Even, or, especially the one with ROM self-checking itself after flashing modded ROM. Grab your reversing skills and use it for your own property, though.

I personally own

HP DV6-6150 (still did not get my hands on this older one)
HP Envy m6-1104SE F.27 ROM with double RSA protection (cracking this motherf.....)

We, owners ow our own property, should not mess with ROM BIOS, HP? Yeah right.

Got an accelerator mSATA SSD and every time I restarted the machine ROM gave me blank screen and I had to unscrew the accelerator (frustration like fu*king morons from HP etc. not expressed here)

We own it, THEY sold it to us, THEY have to give us a chance to do whatever we want.

Mother...

Even looking into the avenues of replacing all that crappy construct with CoreBoot BIOS project.

HP mother..