Thank you and sorry for the mistake.

Well, I'm not surprised that Boot code 1.03 is being distributed with the newer calculators, I just didn't expect it so soon. It's not like it *really* matters since we have workarounds though.

It's going to cause a lot of problems for those who have 1.03 and want to downgrade to 2.43 and don't know about any exploits... The average calculator user doesn't visit any calculator sites. So TI hinders those who didn't want to do anything bad at all, but we can still install third-party OSes if we want to...

Quote from: Art_of_camelot on June 28, 2011, 09:40:22 am

Well, I'm not surprised that Boot code 1.03 is being distributed with the newer calculators, I just didn't expect it so soon. It's not like it *really* matters since we have workarounds though.

It's going to cause a lot of problems for those who have 1.03 and want to downgrade to 2.43 and don't know about any exploits... The average calculator user doesn't visit any calculator sites. So TI hinders those who didn't want to do anything bad at all, but we can still install third-party OSes if we want to...

Well, true, but that is how many users wind up here or similar sites. They google for solutions to such problems. I don't think many average users will take issue with MP 2.55 (or whatever the current version is) anyway. I mean, for maths it's (more or less)fine right?

I guess in general it would probably come handy if a new OS upgrade ever breaks compatibility with the majority of the ASM programs or if somebody releases a popular third-party OS that makes news on popular non-calc sites. Otherwise, when I was in hi-school, I still saw people running 83+ OS 1.03 or something like that and it was in 2001-03.

On the other hand it's still cool for those who wants to install OS 2.71MP on their calc, for example.

I've finally been reported a TI-84 Plus Hardware Revision P (thank you Adriweb), and it came with Boot Code 1.02.

So more accurate rules should be:
- TI-84+ initial hardware revision & hardware revision A: Boot Code 1.00
- TI-84+ hardware revision A-P: Boot Code 1.02
- TI-84+ hardware revision Q or above: Boot Code 1.03

And do you remember how to install custom OSes on Boot Code 1.03 ?

Boot Code 1.03 is using new 2048-bits RSA keys which haven't been factored yet. So we can't sign custom OSes with those keys.

You could use that, or you could use Flashy and the 1.2 bootcode from another calculator, or you could use EpicFail to patch the 2048 bit signature out of the bootcode.

I think the only way for TI to prevent any such hacking would be to remove the Asm command and Flash APP support on new models, but since they're popular due to all the programs for them, I doubt that TI would be able to afford to do that, not to mention they might have left ASM support intact on those calcs just so that the TI-Nspire lockdown pills are easier to swallow for us.

I honestly don't think TI could ever lock us out of the 84 line. We just know too much. No one has ever actually looked for vulnerabilities in the 84+, but I'm sure they exist. We have full OS dissassemblies that include every system call and we know the hardware better than they probably do.

You know, now I kind of want to do this. Run asm code in a non-standard way.