« previous next »
Pages: 1 2 3 [4]   Go Down

Author Topic: New TI-84 Pocket adds anti-downgrade protection against 2.53MP and lower  (Read 21386 times)

0 Members and 1 Guest are viewing this topic.

Offline Deep Toaster

  • So much to do, so much time, so little motivation
  • Administrator
  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 8217
  • Rating: +758/-15
    • View Profile
    • ClrHome
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 »
Logged



Offline Netham45

  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2103
  • Rating: +213/-4
  • *explodes*
    • View Profile
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?
Logged
Omnimaga Admin

Offline TIfanx1999

  • ಠ_ಠ ( ͡° ͜ʖ ͡°)
  • CoT Emeritus
  • LV13 Extreme Addict (Next: 9001)
  • *
  • Posts: 6173
  • Rating: +191/-9
    • View Profile
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.
Logged

Offline Netham45

  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2103
  • Rating: +213/-4
  • *explodes*
    • View Profile
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 »
Logged
Omnimaga Admin

Offline DJ Omnimaga

  • Clacualters are teh gr33t
  • CoT Emeritus
  • LV15 Omnimagician (Next: --)
  • *
  • Posts: 55942
  • Rating: +3154/-232
  • CodeWalrus founder & retired Omnimaga founder
    • View Profile
    • Dream of Omnimaga Music
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.
Logged
Now active at https://discord.gg/cuZcfcF (CodeWalrus server)

Offline JosJuice

  • LV10 31337 u53r (Next: 2000)
  • **********
  • Posts: 1344
  • Rating: +66/-14
    • View Profile
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.
Logged

Offline DrDnar

  • LV7 Elite (Next: 700)
  • *******
  • Posts: 546
  • Rating: +97/-1
    • View Profile
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.
Logged
"No tools will make a man a skilled workman, or master of defense, nor be of any use to him who has not learned how to handle them, and has never bestowed any attention upon them. . . . Yes, [] the tools which would teach men their own use would be beyond price."—Plato's The Republic, circa 380 BC

Offline aeTIos

  • Nonbinary computing specialist
  • LV12 Extreme Poster (Next: 5000)
  • ************
  • Posts: 3915
  • Rating: +184/-32
    • View Profile
    • wank.party
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)
Logged
I'm not a nerd but I pretend:

Offline critor

  • Editor
  • LV11 Super Veteran (Next: 3000)
  • ***********
  • Posts: 2079
  • Rating: +439/-13
    • View Profile
    • TI-Planet
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
Logged
TI-Planet co-admin.

Offline Munchor

  • LV13 Extreme Addict (Next: 9001)
  • *************
  • Posts: 6199
  • Rating: +295/-121
  • Code Recycler
    • View Profile
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 :)
Logged
Pages: 1 2 3 [4]   Go Up
« previous next »