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Author Topic: Help downgrade nspire cx cas from 3.9  (Read 2404 times)

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Offline Cereal_Triumph

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Help downgrade nspire cx cas from 3.9
« on: November 15, 2014, 01:04:17 am »
My Calculator:
Ti nspire cx cas. Hardware revision D. OS version 3.9.0.463.

What Happened:
So after dropping my calculator and having the buttons act improperly (such as the "8" key acting as the "a" key) my first instinct was to try reloading the OS. While panicking (I hoped I wouldn't have to replace my calculator), in an attempt to fix the buttons, I installed the only OS I had available (stupid me) 3.9.0.463. Which did literally nothing. However I now have the buttons under control (at least enough that I don't feel I need to worry) and would like to return to using ndless. Preferably back to the 3.1 version, as I had zero problems with my calculator before dropping it.

What I've Tried:
So the first thing I tried was to use the downgradefix39 program, but after several attempts using this tutorial I gave up as I was unable to send files after reconnecting (ti software wouldn't recognize it as an attached calculator), failing between steps five and six. Then I saw someone say that on hardware pre-J, you should just use nLaunch. And after trying to look into that I realized I had no idea what I was doing, and didn't want to ruin my calculator.

The question:
Is there a way for me to downgrade from 3.9 with only a usb connection to my computer?
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Offline Vogtinator

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Re: Help downgrade nspire cx cas from 3.9
« Reply #1 on: November 15, 2014, 06:33:55 am »
Quote
So after dropping my calculator and having the buttons act improperly (such as the "8" key acting as the "a" key) my first instinct was to try reloading the OS. While panicking (I hoped I wouldn't have to replace my calculator), in an attempt to fix the buttons, I installed the only OS I had available (stupid me) 3.9.0.463. Which did literally nothing. However I now have the buttons under control (at least enough that I don't feel I need to worry) and would like to return to using ndless. Preferably back to the 3.1 version, as I had zero problems with my calculator before dropping it.
Well, that sounds like a contact got loose. It's probably only the keypad connector, you should be able to fix it. I don't know how to disassemble the calc, though.

Quote
So the first thing I tried was to use the downgradefix39 program, but after several attempts using this tutorial I gave up as I was unable to send files after reconnecting (ti software wouldn't recognize it as an attached calculator), failing between steps five and six.
That's a known issue, try this.

Quote
Then I saw someone say that on hardware pre-J, you should just use nLaunch. And after trying to look into that I realized I had no idea what I was doing, and didn't want to ruin my calculator.
You installed OS 3.9 so you have boot2 3.24 now. To get nLaunch, you'd need to reflash using UART. You can always reflash boot2 from nsNandMgr after you installed Ndless 3.6.

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