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Author Topic: TI Nspire CX version downgrade  (Read 7471 times)

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Offline Rykattanak

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TI Nspire CX version downgrade
« on: October 19, 2014, 03:15:32 pm »
Is it possible to downgrade the version of my TI Nspire CX calculator ? I've updated it to 3.9 by mistake, and now I want to downgrade it to 3.2 or smth like that, is it possible ?


Thank You.
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Offline DJ Omnimaga

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Re: TI Nspire CX version downgrade
« Reply #1 on: October 20, 2014, 11:41:36 am »
It depends what hardware revision your calc has. If your serial number ends with letter J or higher, then it's impossible to downgrade. Otherwise, you need an Arduino or RS232-TTL serial interface found online like Ebay then follow tutorials that can be found in older topics to downgrade.
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Offline Alex Twigg

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Re: TI Nspire CX version downgrade
« Reply #2 on: October 22, 2014, 07:10:47 pm »
soo what if it end in a j like mine? what are the steps to downgrading it or a link? thanks
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Offline DJ Omnimaga

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Re: TI Nspire CX version downgrade
« Reply #3 on: October 22, 2014, 08:21:01 pm »
With J hardware, if you got OS 3.9 then you are screwed. Sell your calculator or get a refund, explaining you chose the wrong calc, then buy an older one from the secondary market, asking the reseller about the serial number first.
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Offline DJ Omnimaga

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Re: TI Nspire CX version downgrade
« Reply #4 on: November 03, 2014, 01:24:39 am »
Quote from: Alex Twigg on October 22, 2014, 07:10:47 pm
soo what if it end in a j like mine? what are the steps to downgrading it or a link? thanks
Ok, forget what I just said in my last post, yesterday an utility to downgrade from OS 3.9 just got released: http://tiplanet.org/forum/viewtopic.php?p=172099&sid=fb36298f23817f0a43d587b870cf0c4b#p172099

Keep in mind, however, that hardware J only supports OS 3.6 and higher, so everytime you reboot your calculator, you will need to re-install Ndless, but at least it's better than nothing now. :P
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Offline The_King

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Re: TI Nspire CX version downgrade
« Reply #5 on: November 03, 2014, 01:14:34 pm »
Quote from: DJ Omnimaga on November 03, 2014, 01:24:39 am
Quote from: Alex Twigg on October 22, 2014, 07:10:47 pm
soo what if it end in a j like mine? what are the steps to downgrading it or a link? thanks
Ok, forget what I just said in my last post, yesterday an utility to downgrade from OS 3.9 just got released: http://tiplanet.org/forum/viewtopic.php?p=172099&sid=fb36298f23817f0a43d587b870cf0c4b#p172099

Keep in mind, however, that hardware J only supports OS 3.6 and higher, so everytime you reboot your calculator, you will need to re-install Ndless, but at least it's better than nothing now. :P

OR he can use nlaunch but only keep 3.6 os and delete the other one???
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Offline Hayleia

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Re: TI Nspire CX version downgrade
« Reply #6 on: November 03, 2014, 04:04:10 pm »
Quote from: DJ Omnimaga on November 03, 2014, 01:24:39 am
Keep in mind, however, that hardware J only supports OS 3.6 and higher
Hardware J actually supports 3.2.3 and higher but yeah, as far as Ndless is concerned, we can say "3.6 and higher".

Quote from: The_King on November 03, 2014, 01:14:34 pm
OR he can use nlaunch but only keep 3.6 os and delete the other one???
nlaunch doesn't work on hardware J as far as I know.

But yeah, as DJ_O said, you can now downgrade from 3.9 to 3.6 and use Ndless 3.6.
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