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Author Topic: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower  (Read 23494 times)

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Offline Deep Toaster

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #45 on: June 15, 2011, 07:54:29 pm »
Was just gonna point that out, but then I realized that it's not only that. The TI-83 Plus Silver Edition didn't work with OS 1.12 and below, for instance, but on that one TI didn't take the time and block all third-party OSes with some new form of protection.
« Last Edit: June 15, 2011, 07:54:37 pm by Deep Thought »
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Offline Netham45

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #46 on: June 15, 2011, 11:04:50 pm »
My guess for this is that they're checking for a new signature, or if the MD5 equals something known.

The new signature probably isn't loaded from the cert anymore, either, they learned their lesson on that one.

If you can patch after install, though, it'd be rather trivial to put a new OS in there. Do the standard unlock tricks still work?
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Offline TIfanx1999

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #47 on: June 15, 2011, 11:09:14 pm »
Quote from: ACagliano on June 15, 2011, 07:27:51 pm
Let me play devils advocate. What if the anti-downgrade protection is there because the hardware is designed in a way that would make any earlier OS incompatible or unstable?

Although it *is* possible, it doesn't seem likely.
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Offline Netham45

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #48 on: June 15, 2011, 11:12:12 pm »
they're not going to redesign an architecture that's well over a decade old just to block a small group of hackers.
« Last Edit: June 16, 2011, 02:27:19 pm by Netham45 »
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Offline DJ Omnimaga

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #49 on: June 16, 2011, 12:36:15 am »
Yeah true, unless they were really determined to prevent ASM programs to run on newer models/hardware or something.
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Offline JosJuice

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #50 on: June 16, 2011, 02:22:38 am »
Quote from: critor on June 15, 2011, 05:00:52 pm
Do you want me to try some specific games?
Have you tried running a program that modifies the OS on-calc? If you haven't, I think it would be helpful to see if that still works, or if the flash unlock exploits are blocked.
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Offline DrDnar

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #51 on: June 16, 2011, 03:32:53 am »
IIRC, BrandonW has stated that TI cannot fix the universal flash unlock exploit without removing the ability to send variables directly to the archive.
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Offline aeTIos

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #52 on: June 16, 2011, 01:06:10 pm »
that's crap. they did something good (and thats not positive for us)
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Offline critor

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #53 on: June 23, 2011, 04:59:10 pm »
Have a first look into the new TI-84 Pocket.fr! ;)
http://ti.bank.free.fr/index.php?mod=news&ac=commentaires&id=1208
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Offline Munchor

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Re: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower
« Reply #54 on: June 24, 2011, 07:48:03 am »
Quote from: critor on June 23, 2011, 04:59:10 pm
Have a first look into the new TI-84 Pocket.fr! ;)
http://ti.bank.free.fr/index.php?mod=news&ac=commentaires&id=1208

I really like the fact that it's small :)
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