Ok, reinstalling OS 3.9.1 instead of OS 3.9.0 solved my problem. It's a really strange issue. I wonder what should I do to get ndless on my calculator   

Quote from https://tiplanet.org/forum/viewtopic.php?f=57&t=15497

If your hardware revision is 'S' or above, your calculator will not work correctly with OS <3.9.1, making the downgrade useless.

Therefore, you'll have to wait for a new version of ndless (compatible with 3.9.1) to be released before you can use it.

Thanks DJ,


I have now successfully downgraded the boot2 image!


The current version I'm using is 3.10.16.


However, when I attempt to install OS 3.6 I get this error with "TI-Nspire Computer Link Software"


"You cannot install a version of the OS that is older than the currently installed version."


I'm not sure how the software knows what the current version of the old software was but is there away around it?

I think you are running os 3.1. In that case, you can install ndless 3.1 instead of ndless 3.6, which is much more stable and doesn't need to be reinstalled. Then just follow the instructions to install KhiCas

IIRC, the main issue is the newer hardware revisions. I think it will be very hard to get nLaunch to work on J, K, L and later models, perhaps even harder than getting it to work under OS 3.9 on older models.

I've got an older H model cx cas though, so I still think it would be possible. In fact, I've tnoc'ed 3.9 and I'm willing to stick that straight onto my calc along with the current nlaunch and see if it works

3.9.0.463 is finally out on ti's servers. Instead of 3.9.0.461, they've updated the version
http://education.ti.com/en/us/software/details/en/0607F21D07B14ACB9EE85E57A9C30EDA/ti-nspirecxcas_os

Has anyone successfully decompiled/analyzed the Nspire firmware/OS? I wonder what exactly they changed (besides Ndless blocking).

There's new boot2 files look here:
3.6.0
3.40.0
 
TI-Nspire.img
8E7C572BF2CE821B9DEDC7EC9B59A07B3FA65ECF69C47162421BEA1EBC69CD8F
 
TI-Nspire.cer
BC46F26A6CDE35371652E56E484A47D21BD4D0174E24CDE495183899BADE79CC
 
samples.zip
85F3B663C501CCFCD86E4F173AB52B3FA3A43F8729D457ECACCBFC42EEA8FD06
 
boot2.img
30A8567643707B21457E91388A37053853CE9B444BD8D2D1277D8247CBB95AD0
 
boot2.cer
4FA74D4E90648FDEB22C69084DFBC7789C5DB0764A5602325CB4796A4416ABD5
 
boot2.dat
F91A58FE1A2107DA6A472277E6DCD377D2AB796D73894B3A2DC0DDA4517AF4BA
 
 

and now:

3.9.0
3.40.0
 
TI-Nspire.img
F23789D2FEA30D907D7BAD6532BD0D6DAB3B992101EBDF6BBB7858F3C91DE21C
 
TI-Nspire.cer
BC46F26A6CDE35371652E56E484A47D21BD4D0174E24CDE495183899BADE79CC
 
samples.zip
4A9CE92F75659347E7F8EACE30FCA930E5376C7BC35C20EC0F94F580E68B58C9
 
boot2.img
30A8567643707B21457E91388A37053853CE9B444BD8D2D1277D8247CBB95AD0
 
boot2.cer
4FA74D4E90648FDEB22C69084DFBC7789C5DB0764A5602325CB4796A4416ABD5
 
boot2.dat
B9E9C409243EBFBE16C0D53CF21E517AE5C117FD484F99C797DC22DB6F8AA3DE
 

 

I posted this also on TI-Planet.
it seems to me that the OS included in the 3.6/3.1 switching pack does not allow custom ndless.cfg files. Can I do this in any way?

The extensions required have already been put into ndless 3.6. Just download that from here http://www.ndless.me and there's nothing to worry about. Custom files are not required

Hi msdnspecial,


Welcome to Omnimaga!


Enjoy some peanuts!



To answer your question, you can use both oses using nlaunch. Ndless is also supported on os 3.6. See here http://www.ndless.me for ndless and here http://tiplanet.org/forum/viewtopic.php?f=57&t=13213&hilit=nlaunch for nlaunch.


Enjoy!

You've got a d version cx and it should still be able to run ndless 3.1 as well as multiple oses via nlaunchy (I've got an h version model which runs 3.2/3.6).