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Author Topic: Hardware needed to downgrade 3.2.4  (Read 6899 times)

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Offline ForteGX

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Hardware needed to downgrade 3.2.4
« on: September 13, 2013, 12:24:41 am »
Hi,
I probably, should have done some more research before buying a Ti-Nspire CX CAS with the OS 3.2.4. But I have been looking around and there is some mention of hardware that could downgrade my OS? I looked around, but I really didn't see what I would need and what I would need to do once I have it. Is there a guide?
Thanks
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Offline DJ Omnimaga

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Re: Hardware needed to downgrade 3.2.4
« Reply #1 on: September 13, 2013, 12:29:24 am »
Hi and welcome to the forums. :)

Unfortunately, if your calculator serial number (check the back of the calculator) ends with the letter J or higher, then no external hardware will be able to downgrade the calc. However, if your calculator has the letter I or below, then an RS232/TTL adapter is required. There must be guides on TI-Planet website (perhaps some in English).
« Last Edit: September 13, 2013, 12:29:42 am by DJ Omnimaga »
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Offline ForteGX

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Re: Hardware needed to downgrade 3.2.4
« Reply #2 on: September 13, 2013, 12:38:40 am »
The number on the back is 2225022676 P-02131, unless the 1's are I's I'm not sure what it means.
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Offline critor

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Re: Hardware needed to downgrade 3.2.4
« Reply #3 on: September 13, 2013, 02:52:23 am »
In fact it's 2225022676 P-0213I.

You've got hardware revision I, and it came preflashed with the 3.2.4 versions if I understood well.

As for today, we don't know if HW-I can be downgraded to 3.1 versions.

Assuming it cas, you need an USB/TLL interface. They're often using an FTDI chip:



You then connect 3 cables to the following pins on the Dock/J01 port:


And you just send the 3.1 Boot2 image file with the HyperTerminal software included on Windows for example.
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Offline Streetwalrus

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Re: Hardware needed to downgrade 3.2.4
« Reply #4 on: September 13, 2013, 10:21:38 am »
Just so you know, an Arduino Uno with the chip removed can be used as a USB TTL adapter. ;)
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Offline DJ Omnimaga

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Re: Re: Hardware needed to downgrade 3.2.4
« Reply #5 on: September 13, 2013, 11:56:00 am »
Btw, could someone go to jail if he installed Ndless on his TI-Nspire? I know that someone who hacked his Playstation 3 was sentenced to jail or something after Sony took legal action O.O
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Offline Streetwalrus

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Re: Hardware needed to downgrade 3.2.4
« Reply #6 on: September 13, 2013, 04:21:53 pm »
Oh you're talking about that German guy who had legal issues because he was working on ps3 Linux or something ?
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Offline Levak

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Re: Hardware needed to downgrade 3.2.4
« Reply #7 on: September 13, 2013, 05:53:57 pm »
Quote from: Streetwalker on September 13, 2013, 10:21:38 am
Just so you know, an Arduino Uno with the chip removed can be used as a USB TTL adapter. ;)
Why removed ? This (below) works perfectly.
https://tiplanet.org/forum/gallery/image_page.php?album_id=4&image_id=186
« Last Edit: September 13, 2013, 05:54:24 pm by Levak »
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Offline Hooloovoo

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Re: Hardware needed to downgrade 3.2.4
« Reply #8 on: September 13, 2013, 06:34:27 pm »
You don't even have to be running a sketch on the arduino. If you short the reset pin on the arduino to ground, it acts like a USB TTL adapter.
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Offline Streetwalrus

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Re: Hardware needed to downgrade 3.2.4
« Reply #9 on: September 13, 2013, 07:02:09 pm »
Yeah, if you don't ground the reset pin or remove the chip it will interfere with the communication.
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