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Author Topic: Calculator OS replacement  (Read 6880 times)

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Offline XiiDraco

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Calculator OS replacement
« on: December 14, 2012, 09:55:03 pm »
I am trying to download the OS 2.55MP to my calculator(yes I know it sucks). I need to get it to the calc so I can downgrade, but every time I put it on it freezes at validating.
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Offline Darl181

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Re: Calculator OS replacement
« Reply #1 on: December 14, 2012, 09:57:33 pm »
Validating takes a while on boot code 1.03 (which I'm guessing you have), iirc it can get upwards of 10 minutes :/
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Offline XiiDraco

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Re: Calculator OS replacement
« Reply #2 on: December 14, 2012, 10:00:23 pm »
Quote from: Darl181 on December 14, 2012, 09:57:33 pm
Validating takes a while on boot code 1.03 (which I'm guessing you have), iirc it can get upwards of 10 minutes :/

Just realized that, my bad.
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Offline FloppusMaximus

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Re: Calculator OS replacement
« Reply #3 on: December 14, 2012, 10:04:07 pm »
Pathetic.  No reason for simple validation to be that slow.  They should have asked me to write the code for them. ;)
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Offline calc84maniac

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Re: Calculator OS replacement
« Reply #4 on: December 14, 2012, 10:07:26 pm »
There was no reason to use such large signing keys in the first place :/
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Offline XiiDraco

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Re: Calculator OS replacement
« Reply #5 on: December 14, 2012, 10:10:35 pm »
Quote from: FloppusMaximus on December 14, 2012, 10:04:07 pm
Pathetic.  No reason for simple validation to be that slow.  They should have asked me to write the code for them. ;)

ROFL XD
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Offline DJ Omnimaga

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Re: Calculator OS replacement
« Reply #6 on: December 15, 2012, 12:37:38 am »
Quote from: calc84maniac on December 14, 2012, 10:07:26 pm
There was no reason to use such large signing keys in the first place :/

TI wanted to take pre-emptive measures for when we get able to crack them.

By 2025, the TI-84 Plus series will use 65536 bits RSA keys.
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Offline DrDnar

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Re: Calculator OS replacement
« Reply #7 on: December 15, 2012, 04:37:44 am »
Quote from: XiiR3CR34T10N on December 14, 2012, 10:00:23 pm
Quote from: Darl181 on December 14, 2012, 09:57:33 pm
Validating takes a while on boot code 1.03 (which I'm guessing you have), iirc it can get upwards of 10 minutes :/

Just realized that, my bad.
You need to patch/downgrade your boot code. It's really quite funny: we only figured out that hacking the boot code was possible as a consequence of us researching ways to get around the new keys. Although, really, I've always felt that the best method would be to write an entirely new OS receiver, which we can do because there's a nearly unfixable bug in the OS. (According to BrandonW, fixing it would require removing the ability to send variables directly to the archive, or completely rewriting the entire variable receiving code.)
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Offline XiiDraco

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Re: Calculator OS replacement
« Reply #8 on: December 15, 2012, 03:06:06 pm »
I finished downgrading last night and now I'm going to work on the game today.
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