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Calculator Community => TI Calculators => General Calculator Help => Topic started by: chicagobears54 on August 09, 2013, 02:42:56 pm

Title: Please Help!
Post by: chicagobears54 on August 09, 2013, 02:42:56 pm

I deleted the OS to try to install version 3.1 and ndless, and it still wouldn't let me downgrade. But when I tried to put 3.2.3 back onto the device, it said that I couldn't install a version of the OS the is older than the currently installed version, which doesn't make sense because there isn't an OS installed and the OS I am trying to install is the newest version there is. Now the calculator just is at a screen that says "Operating system not found. Install OS now." Please help me!

Title: Re: Please Help!
Post by: critor on August 09, 2013, 02:47:45 pm

It seems you originally had OS 3.2.4 or 3.3.
They've set a minimal OS version in a non officially accessible flash area (something like 3.2.xxxx).

As 3.1 is inferor to that version, it is being rejected.

Could you get me your Boot2 version?
With the TI-Nspire Computer Link, it's in the Tools\Informations menu.
(you can't get this with the full Nspire Software)

Title: Re: Please Help!
Post by: chicagobears54 on August 09, 2013, 02:54:19 pm

Yeah the boot2 version is 3.24.7

Title: Re: Please Help!
Post by: Lionel Debroux on August 09, 2013, 02:57:17 pm

Therefore, for now at least, you're stuck with 3.2.4 or 3.3...
That is, unless you have / can buy / can borrow a RS232 TTL / USB adapter and you're willing to use it for downgrading your calculator's boot2. The procedure is not complicated, but it requires hardware not provided with the calculator.
Yeah, I know, the situation sucks for users, and it's TI's fault...

Title: Re: Please Help!
Post by: critor on August 09, 2013, 03:00:16 pm

Quote from: chicagobears54 on August 09, 2013, 02:54:19 pm

Yeah the boot2 version is 3.24.7

Worst case possible then...

The only way is reflashing the Boot2 to version 3.1, but for that you'll need an USB/TTL interface (often referred as RS232) to connect to the dock/J01 connector.

Title: Re: Please Help!
Post by: chicagobears54 on August 09, 2013, 03:00:33 pm

Where can I download 3.2.4 or 3.3? I can't seem to find it. Right now I just want to get my calculator working.

Title: Re: Please Help!
Post by: Lionel Debroux on August 09, 2013, 03:02:50 pm

You can find them on TI-Planet, for instance: http://tiplanet.org/forum/archives_list.php?id=OS+Nspire

And you should edit your previous post instead of double-posting :)

Title: Re: Please Help!
Post by: chicagobears54 on August 09, 2013, 03:10:46 pm

Thank you so much! I have a working calculator now!

Oh haha I will in the future, I'm new here :)

Title: Re: Re: Re: Please Help!
Post by: DJ Omnimaga on August 11, 2013, 12:07:48 pm

Quote from: Lionel Debroux on August 09, 2013, 02:57:17 pm

Therefore, for now at least, you're stuck with 3.2.4 or 3.3...
That is, unless you have / can buy / can borrow a RS232 TTL / USB adapter and you're willing to use it for downgrading your calculator's boot2. The procedure is not complicated, but it requires hardware not provided with the calculator.
Yeah, I know, the situation sucks for users, and it's TI's fault...

wait, I thought that with 3.2.4 or above, even the RS232 TTL/USB adapter method didn't work? ???

Title: Re: Please Help!
Post by: Streetwalrus on August 11, 2013, 12:09:51 pm

Quote from: DJ Omnimaga on August 11, 2013, 12:07:48 pm

Quote from: Lionel Debroux on August 09, 2013, 02:57:17 pm
Therefore, for now at least, you're stuck with 3.2.4 or 3.3...
That is, unless you have / can buy / can borrow a RS232 TTL / USB adapter and you're willing to use it for downgrading your calculator's boot2. The procedure is not complicated, but it requires hardware not provided with the calculator.
Yeah, I know, the situation sucks for users, and it's TI's fault...
wait, I thought that with 3.2.4 or above, even the RS232 TTL/USB adapter method didn't work? ???

It does work. Just that not everybody has it. ;) TI just can't remove this as this would be equivalent to removing DFU mode on iThings : bricked devices that could be saved with this kind of "Recovery" mode would die for stupid reasons.

Title: Re: Please Help!
Post by: tonzaysi7 on January 15, 2014, 04:20:40 pm

Hello, I would like to downgrade my Nspire CX CAS boot2 version because I accidentally updated it, before I knew that it is impossible to downgrade your OS if you have boot2 version of 3.24.7 I also heard about the TNOC tool just after I updated the boot2.

I would just like to have a more specific information about the downgrading progress,
What does the USB/TTL adapter look like? Where do I get one? I have tried to google about it but so far I have found no solutions.

Please help me out :)

Edit: My model number is P-0712F so its between A and I.

Title: Re: Please Help!
Post by: DJ Omnimaga on January 15, 2014, 05:48:13 pm

This should be the hardware you need and how it looks like. http://ourl.ca/19570/360687

It costs about $10 on Ebay if you live in France or United States. If you live elsewhere, there is a 0.0001% chance that you have to re-mortgage your house in order to afford the USB/TTL adapter (or the shipping fees).

As for the guide, I think this is what you need http://ourl.ca/20292/371533 .

Of course I have quit Nspire stuff since long ago so I am not very familiar with everything, so I wouldn't be able to help much more myself.

Title: Re: Please Help!
Post by: Keoni29 on January 16, 2014, 05:06:12 am

These things are really really cheap. No shipping cost: http://www.ebay.com/itm/USB-To-RS232-TTL-Auto-Converter-Module-Converter-Adapter-For-Arduino-S9-hv2n-/301019253456?pt=LH_DefaultDomain_2&hash=item4616254ad0

Less than $1
If you only use it once this will do. If you plan to use it more often: go for one that's a little bit more expensive. The build quality of this cheap thing will not be great.

Title: Re: Please Help!
Post by: tonzaysi7 on January 16, 2014, 10:33:14 am

Quote from: DJ Omnimaga on January 15, 2014, 05:48:13 pm

This should be the hardware you need and how it looks like. http://ourl.ca/19570/360687

It costs about $10 on Ebay if you live in France or United States. If you live elsewhere, there is a 0.0001% chance that you have to re-mortgage your house in order to afford the USB/TTL adapter (or the shipping fees).

As for the guide, I think this is what you need http://ourl.ca/20292/371533 .

Of course I have quit Nspire stuff since long ago so I am not very familiar with everything, so I wouldn't be able to help much more myself.

Okay, I ordered now the Arduino uno and the adapter for it ( and it was only like 11 euros total :D. I'm just thinking the part of attaching the wires to my nspire because the wires look like this: http://www.ebay.com/itm/PL2303HX-USB-To-RS232-TTL-Auto-Converter-Adapter-controller-Module-for-arduino-/400565253775?pt=LH_DefaultDomain_0&hash=item5d438cb68f (http://www.ebay.com/itm/PL2303HX-USB-To-RS232-TTL-Auto-Converter-Adapter-controller-Module-for-arduino-/400565253775?pt=LH_DefaultDomain_0&hash=item5d438cb68f).

I ordered:

Spoiler For Spoiler:

Title: Re: Please Help!
Post by: dreamdragon on January 16, 2014, 05:14:48 pm

Quote from: tonzaysi7 on January 16, 2014, 10:33:14 am

Quote from: DJ Omnimaga on January 15, 2014, 05:48:13 pm
This should be the hardware you need and how it looks like. http://ourl.ca/19570/360687

It costs about $10 on Ebay if you live in France or United States. If you live elsewhere, there is a 0.0001% chance that you have to re-mortgage your house in order to afford the USB/TTL adapter (or the shipping fees).

As for the guide, I think this is what you need http://ourl.ca/20292/371533 .

Of course I have quit Nspire stuff since long ago so I am not very familiar with everything, so I wouldn't be able to help much more myself.

Okay, I ordered now the Arduino uno and the adapter for it ( and it was only like 11 euros total :D. I'm just thinking the part of attaching the wires to my nspire because the wires look like this: http://www.ebay.com/itm/PL2303HX-USB-To-RS232-TTL-Auto-Converter-Adapter-controller-Module-for-arduino-/400565253775?pt=LH_DefaultDomain_0&hash=item5d438cb68f (http://www.ebay.com/itm/PL2303HX-USB-To-RS232-TTL-Auto-Converter-Adapter-controller-Module-for-arduino-/400565253775?pt=LH_DefaultDomain_0&hash=item5d438cb68f).

I ordered:
Spoiler For Spoiler:
http://www.ebay.com/itm/PL2303HX-USB-To-RS232-TTL-Auto-Converter-Adapter-controller-Module-for-arduino-/400565253775?pt=LH_DefaultDomain_0&hash=item5d438cb68f

and

http://www.ebay.com/itm/UNO-R3-ATmega328P-ATmega16U2-Compatible-Version-Board-Free-USB-Cable-For-Arduino-/370966395125?pt=LH_DefaultDomain_0&hash=item565f51f8f5

i checked the hyperlink.
whats that thingy for, and how do u use it? ???

Title: Re: Please Help!
Post by: Lunar Fire on January 16, 2014, 06:19:05 pm

This thing is commonly called a USB-to-RS232 TTL converter. It is used to directly interface a USB port on a computer to a port using a RS232 (Serial) communication protocol with a TTL (0-5V) signal.

RS-232 TTL is what the dock connector on a TI-NSpire uses. This connector can be used to bypass USB communication and interface directly with the calculator to do things that are impossible with a USB link like in this case downgrading the calculator bootcode.

Fully understanding this requires some basic knowledge in electronics, and even then trying to explain it to someone can be kinda hard. I suggest you check the Wikipedia pages on TTL and RS-232 to have a more in-depth understanding of it works. You could also look for documentation on the USB protocol, but this is way more complex, probably too much for someone with no prior knowledge of electronic communication protocols.

Title: Re: Re: Please Help!
Post by: DJ Omnimaga on January 16, 2014, 07:28:36 pm

Also be lucky if your calc serial number ends with letter A to I. The RS232/TTL converter doesn't work with calcs that end with J and K (the newer ones).