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Author Topic: Downgrade Nspire OS  (Read 8012 times)

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Offline apcalc

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Downgrade Nspire OS
« on: April 06, 2010, 08:43:33 pm »
Hi.  I am trying to downgrade the OS on my TI Nspire.  I have a copy of OS 1.1 on my computer and I want to send it.  I used the method on hackspire.com.  I tried sending the new OS and pulling the keypad when it was installing (I pulled it when it was at 60%).  I then put the 84 keypad back in, turned on, then put the Nspire keypad back in.  The OS 2.0.0.1188 was still there.  How do I downgrade.  Also, what would happen if I changed the file extension of the OS from .tnc to .tno.  Would I be able to run the CAS on a regular Nspire?  Thanks!
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Offline bwang

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Re: Downgrade Nspire OS
« Reply #1 on: April 06, 2010, 10:25:50 pm »
How old is the Nspire? Is it one of the new touchpad Nspires?
No, you cannot run the CAS OS on the non-CAS that way (it validates the image to prevent that).
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Offline DJ Omnimaga

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Re: Downgrade Nspire OS
« Reply #2 on: April 06, 2010, 10:41:03 pm »
If it's an old one (most likely light gray and white or light blue), normally you should be able to completly erase the calc OS by removing a battery, then hold down Home, P, Enter and ON keys at the same time until you get a menu after the loading bar reached half. The following will cause all your programs, games and files to be lost! Then select an option to format the calculator including erasing the entire OS. Once done you need to reboot again then when asked, send a new OS.

If it's a newer Nspire, the one with a touchpad instead of clickpad, you cannot downgrade lower than OS 2.0.
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Offline Silver Shadow

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Re: Downgrade Nspire OS
« Reply #3 on: April 07, 2010, 02:33:25 am »
I always thought that to downgrade, all you had to do was provide the PC program with the OS and it did everything for you...
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Offline DJ Omnimaga

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Re: Downgrade Nspire OS
« Reply #4 on: April 07, 2010, 02:58:25 am »
Yeah, this is why I am wondering why he can't downgrade x.x I wonder what could be causing it...

I think I heard about this happenign before too...
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Offline apcalc

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Re: Downgrade Nspire OS
« Reply #5 on: April 07, 2010, 03:24:21 pm »
Hi.  Thanks for your help!  I will try this method soon, but I have other work to do (English, Idylls of the King :( :() and I do not have the time to send a new OS.  I tried just sending OS 1.1, but it just put OS 2.0.0.1188 back on it.  I do have one of the old blue ones.
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Offline Silver Shadow

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Re: Downgrade Nspire OS
« Reply #6 on: April 07, 2010, 03:29:45 pm »
That's strange... Are you sure that you have enough free memory on the calc?
Besides, I wouldn't really bother with downgrading right now since Ndless2 will hopefuly be released soon.
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Offline DJ Omnimaga

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Re: Downgrade Nspire OS
« Reply #7 on: April 07, 2010, 04:35:48 pm »
Not to mention if your blue calc is from the last year, it's pretty annoying to turn back on with OS 1.1 on it anyway. You need to remove a battery everytime.
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Offline bwang

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Re: Downgrade Nspire OS
« Reply #8 on: April 07, 2010, 06:04:10 pm »
Or use calc84's utility.
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Offline calc84maniac

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Re: Downgrade Nspire OS
« Reply #9 on: April 07, 2010, 06:32:56 pm »
Quote from: bwang on April 07, 2010, 06:04:10 pm
Or use calc84's utility.
Even that is annoying though :(
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"Most people ask, 'What does a thing do?' Hackers ask, 'What can I make it do?'" - Pablos Holman

Offline DJ Omnimaga

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Re: Downgrade Nspire OS
« Reply #10 on: April 07, 2010, 06:46:16 pm »
true, especially if you forget to select it before the calc turns off, and you forgot your cursor position. Good luck trial and erroring
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