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Nspire OS 3.9.1 can now be downgraded (already) :D

Started by Dream of Omnimaga, December 28, 2014, 12:14:26 PM

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Dream of Omnimaga

See original post on TI-Planet: http://tiplanet.org/forum/viewtopic.php?f=43&t=15780&lang=en

Looks like this one downgrade didn't took as long to come out. I suspect there wasn't much changes in the OS or TI didn't try much harder to find a new way to block downgrades. :D

However, no CAS nor Clickpad/Touchpad support yet: Just regular TI-Nspire CX. But yeah, basically if you were stuck on OS 3.9.1 (which isn't even available on TI servers yet, but is starting to appear on new calcs), then you can now go back to 3.6 and use Ndless! :)

You can download the utility here: DowngradeFix 3.9

And read the tutorial here: http://tiplanet.org/forum/viewtopic.php?f=57&t=15497&p=172096#p172096
  • Calculators owned: TI-82 Advanced Edition Python TI-84+ TI-84+CSE TI-84+CE TI-84+CEP TI-86 TI-89T cfx-9940GT fx-7400G+ fx 1.0+ fx-9750G+ fx-9860G fx-CG10 HP 49g+ HP 39g+ HP 39gs (bricked) HP 39gII HP Prime G1 HP Prime G2 Sharp EL-9600C
  • Consoles, mobile devices and vintage computers owned: Huawei P30 Lite, Moto G 5G, Nintendo 64 (broken), Playstation, Wii U

novenary

Well the os was built a while ago, long before ti planet released the downgrade utility. :)

Dream of Omnimaga

True, but the timespan between its release and the downgrade utility seemed much shorter than with OS 3.9 and others to me. Maybe TI-Planet just found a new exploit that TI just can't figure out?

Also being able to downgrade this easily means that the team doesn't need to invest as much time into Ndless 3.9 or 3.9.1, as people can simply downgrade to 3.1 or 3.6 if they want to use it.
  • Calculators owned: TI-82 Advanced Edition Python TI-84+ TI-84+CSE TI-84+CE TI-84+CEP TI-86 TI-89T cfx-9940GT fx-7400G+ fx 1.0+ fx-9750G+ fx-9860G fx-CG10 HP 49g+ HP 39g+ HP 39gs (bricked) HP 39gII HP Prime G1 HP Prime G2 Sharp EL-9600C
  • Consoles, mobile devices and vintage computers owned: Huawei P30 Lite, Moto G 5G, Nintendo 64 (broken), Playstation, Wii U

aetios

ceci n'est pas une signature

Duke "Tape" Eiyeron

What about the self destruction sequence? Is there any news about such a routine?
  • Calculators owned: A lot.

Dream of Omnimaga

Not yet. Critor tried to trigger it in various ways, to no avail.
  • Calculators owned: TI-82 Advanced Edition Python TI-84+ TI-84+CSE TI-84+CE TI-84+CEP TI-86 TI-89T cfx-9940GT fx-7400G+ fx 1.0+ fx-9750G+ fx-9860G fx-CG10 HP 49g+ HP 39g+ HP 39gs (bricked) HP 39gII HP Prime G1 HP Prime G2 Sharp EL-9600C
  • Consoles, mobile devices and vintage computers owned: Huawei P30 Lite, Moto G 5G, Nintendo 64 (broken), Playstation, Wii U

novenary

#6
Quote from: DJ Omnimaga on December 29, 2014, 11:11:13 PM
True, but the timespan between its release and the downgrade utility seemed much shorter than with OS 3.9 and others to me. Maybe TI-Planet just found a new exploit that TI just can't figure out?
Nope. It just means that the exploit was completely unknown when the OS was built so chances that TI fixed it in there are small. They probably just had to adapt some things in the downgrade utility to make it compatible (ie, code offsets and such).

Dream of Omnimaga

It's possible as well, although TI is normally quick on the lockdown trigger. I guess we'll see with OS 3.10.0 (I doubt they'll call it 4.0 because people will confuse the 84+CSE OS)
  • Calculators owned: TI-82 Advanced Edition Python TI-84+ TI-84+CSE TI-84+CE TI-84+CEP TI-86 TI-89T cfx-9940GT fx-7400G+ fx 1.0+ fx-9750G+ fx-9860G fx-CG10 HP 49g+ HP 39g+ HP 39gs (bricked) HP 39gII HP Prime G1 HP Prime G2 Sharp EL-9600C
  • Consoles, mobile devices and vintage computers owned: Huawei P30 Lite, Moto G 5G, Nintendo 64 (broken), Playstation, Wii U

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