As explained in a previous news, changes on the motherboard in new TI-Nspire CX hardware revision J and above are making them incompatible with versions 3.1, and thus with Ndless / nLaunch.

Hardware revision	Motherboard	ASIC	Boot1	NAND	Keyboard	Dockboard	Photo	3.1 compatibility
Initial	Firebird Color MB 6421		3.0.0.99	Samsung K511F12ACA-B075				yes
A	Firebird Color MB 6422	ET-NS2010B-1	3.0.0.99	Samsung K511F12ACA-B075	Firebird Color KB EVT 4421	Firebird Color BTB EVT1.2 2412		yes
B	Firebird Color MB 6422	ET-NS2010B-1	3.0.0.99	Samsung K511F12ACA-B075	Firebird Color KB EVT 4421	Firebird Color BTB EVT1.2 2412		yes
C	Firebird Color MB 6422	ET-NS2010B-1	3.0.0.99	Samsung K511F12ACA-B075	Firebird Color KB EVT 4421	Firebird Color BTB EVT1.2 2412		yes
D	Firebird Color MB 6422	ET-NS2010B-1	3.0.0.99	Samsung K511F12ACA-B075	Firebird Color KB EVT 4421	Firebird Color BTB EVT1.2 2412		yes
E			3.0.0.99					yes
F	Firebird Color MB 6430	ET-NS2010B-1	3.0.0.99	Samsung K511F12ACA-B075	Firebird Color KB EVT 4421	Firebird Color BTB EVT1.2 2412		yes
G			3.0.0.99					yes
H			3.0.0.99					yes
I			3.0.0.99					yes
J	NSC CR MB 4440	ET-NS2010B-1	3.0.0.99	ESMT FM60D1G12A	Firebird Color KB DVT 4424	Firebird Color BTB EVT1.2 2412		no
K			3.0.0.99					no

A Chinese online shop nosed the bargain and has started selling hundreds of TI-Nspire CX spare parts: 3.1 compatible TI-Nspire CX motherboards, thus compatible with Ndless / Nlaunch.
The motherboard reference is Firebird Color MB 6421. So it's the motherboard used in the initial version of the hardware, prior to hardware revision A.

Currently there are:

• 200 TI-Nspire CX motherboards  at 200 yuan each (about 25€ or 35$)
  
• 50 motherboards TI- Nspire CX CAS for 300 yuan coin (about 35€ or 50$)

An affordable and easy to install motherboard for new extraordinary possibilities with your TI-Nspire CX!

We tested, and installing the old motherboard together with the more recent keypad board doesn't cause any problem.

Note that the TI-Nspire CX and TI-Nspire CX CAS motherboards are apparently identical.
But do not attempt to turn your TI-Nspire CX intro a TI-Nspire CX CAS with a TI-Nspire CX CAS motherboard, because it just does not work . TI knows of this method (commonly called 'case-switching') and has made things more difficult than that: as the motherboard, the keypad board has the CAS and non-CAS types too. If you mix the types, the OS does notice it when launched and will either:

• display a blocking error message about an incorrect keypad
• reboot automatically

You would need to buy the CAS version of the TI-Nspire CX keypad board too for such a purpose, of course if you can find such a spare part.
Note that it may be possible to bypass this protection by using a current or future version of nLaunch, although it has not been tested yet. But even in this case, it would be dangerous to be forced to use Nlaunch to make your calculator work, when TI clearly wants to make everything possible in order to block it.


Links :
TI-Nspire CX motherboard
TI-Nspire CX CAS motherboard

Source :
http://tiplanet.org/forum/viewtopic.php?f=43&t=13304&lang=en

No soldering required.
The board is just clipped and screwed.

Ah ok, what about the screen?

Ah ok. I was worried about it being tied to the mobo and requiring some special glue or extreme care to be connected to a new one.

At least I'm glad swapping mobos works, since on the Xbox 360, you can't even swap an hard drive without flashing it first. That said, knowing TI, the days until this stops working are most likely counted, although I doubt they can do much about the store re-selling those motherboards, since it's located in China.

So I just reveiced mine today ! Delivery took 3 Weeks, but what do you expect when it is coming all the way from China (shipping was free)!

Anyway, just wanted to say is that they sent me a Firebird_Color_MB_6422 and not a Firebird_Color_MB_6421, as displayed in the description!

Edit: It's the CAS version btw

Anyway, just wanted to say is that they sent me a Firebird_Color_MB_6422 and not a Firebird_Color_MB_6421, as displayed in the description!

Hmm I hope that not too many people get the wrong board (at least not a non-Ndlessable one). Welcome to the forums, by the way!

Interesting !
Tell us how the process goes

I used Google translate to get around the site, it runs quite well! Confirming your registration on their Website is done by SMS (there is an option for email registration but it didn't work for me...)
You can only pay by Credit Card. There is an Option for "Paypal" but that's Google translate mixing up the Chinese equivalent of PayPal, Alipay with the western used PayPal! After that it will automatically register you to Alipay, where, when you are prompted on your profile page, will need to confirm the payment. After that you just have to wait the 3 weeks (depends !).

Still such a pity that now we have to resort to hardware mods. However, this method is better than nothing!