As you may know Ndless tightly integrates with the TI-Nspire OS, and each installer is developed for a specific OS version.
The latest Ndless 3.6/3.9 is not compatible with OS 4.0. Do not upgrade to OS 4.0 at the moment as you won’t able to downgrade and use Ndless! If you want to know more about the OS dowgrade protection and the cat and mouse game between Ndless and TI, read this post.
You should know that updating the Ndless installer is hard work. Please subscribe to new posts to be notified once its ready. No ETA can be given, sorry for the annoyance if you were wrongly adviced to update by Student Software (and blame TI for it).
ndlessly 
Is it possible to downgrade, or is this OS nLaunchy compatible? I would enjoy give it a try :/
This is pretty lame. I downloaded supposedly v3.9 nspire firmware from http://education.ti.com/en/us/software/update/download-os-nspirecxcas-latest but it’s actually 4.0 and I was blind and didn’t check. now I’m stuck with 4.0. hope the downgrader or new ndless version comes out soon.
When do you think you will have cracked 4,0 as well?
The only reason I want to install ndless is to overclock the calculator so that it will work quicker during exams, not to allow me to cheat.
If TI are serious, they should update the processor or otherwise allow us to overclock it.
ohh no :/ when i crashed my nspire cx i buy new nspire cx CAS :D and i look for number of sys. version and its 4.0 :( plees create a fix soon :D .. emm aand how far did you please ? :)
Darn it, just got a CX CAS yesterday, looks like my OS is 4. I guess it’s finger crossing time.
I have a CX CAS L running OS 4, is there a way to downgrade to 3.9??
I don’t know if knowing my boot2 3.9.1.34 can help.
Regards!!
Ndless 4.0 Hopefully soon
My calculator came with the OS 4 |:
Hey ExtendeD any update on progress on OS 4? Like others I bought a new CX after my 3.1 was stolen and it was pre installed 4.
Can’t someone take the 3.9 OS and modify it so it pretends to be version 4.1?
I really hope so, I don’t even know what language the Nspire’s OS runs on.
No TI keep updating the software to kill off ndless
They kill it off because it’s illegal to use an nspire running ndless on the SAT and other important tests
Define “illegal”
Hello, I just recently got a TI NSpire CX, and I am new to Ndless. I was wondering, are calculators with Ndless on it allowed for use in official exams, such as the SAT? Please help, thank you.
Technically? Who knows. In reality? Who would ever know. If it’s not a CAS (which is okay on SAT but not ACT) there is no outward markings that would give it away, and nobody actually checks the software on your calculator.
That being said, the SAT rules would be verry difficult to break, as they allow the CAS and Ti-89 anyway. As for the ACT, you would need a third party algebra solver to even count as cheating. So I would say Ndless itself would not be a problem, even if anyone found out (which they would not).
My TI Nspire CX CAS JUST FORCED ME TO UPGRADE! I hit a button and out of nowhere BOOM, it restarts, loads up, and says “Operating system not found, install OS now”. Download same, 3.9 OS online from a forum and TI PC software says you cannot install “older” software even though it is the same exact version. I am forced to install 4.0 or I have a BRICK for a calculator!
All I was doing was calculus homework!
We will eventually need Ndless 4.0.
I vowed never to upgrade to 4.0 so that I could overclock, now I have no choice if I want anything besides a rectangular plastic doorstop with lots of buttons.
So How could a 4.0.0.235 user assist in the creation of an ndless 4.0?
Is ndless 4.0 scheduled?
how it 4.0 ndless comes soon i have been waiting for a while.
I would like to know when this comes out also I just got my calculator today…
i have a ti nspire with os 4.0 when ndless 4.0 come?
any news about ndless 4.0.???
Any progress being made? I really want to test this OS, without worries of being stuck to it forever :(
Its been so long..i really wanna use games on the my tinspire, please hurry!!!
How about in October? Please?
This update has taken much longer compared to the past updates… Any progress to announce? I am getting very worried.
In fact, its taking the same time as 3.6
Does anyone know the address of OS 4. It would help in order to make nlaunchy able to run it
It’d be nice if we could get a progress report. All the calculators come stock with 4.0 now.
Is there a way to convert TI 84 Files into Files that are compatible for the TI nspire?
I don’t think this is a good place to ask that. Try reddit.com/r/nspire
Thanks!
I just want to say……. You guys are great. I’m looking forward to the release of Ndless4.0!
Now, it was released 4.0.3. I still havent understood how all this Boot1.5 works. Does anyone knows if it is actually reflashable to boot2 3.1 and removing the boot1.5 by USB-TTL?
wait is it out?
Comonnnnnnnnnnnnn guysss!!!!!!!!!!!! I neeed the nspire software man!!!!!
Me tooo :( im still hoping and waiting… would be nice to have some informations.
If ndless 4.0 works comes out i’ll give you guys a donation!
Maybe they plan to release it on Christmas?! I hope they do!!! Come on guys!! We want Ndless for 4.0!!!!
Guys! It’s out!! https://github.com/ndless-nspire/Ndless/releases/tag/v4.0
YUSSSSS!!!!
THANK CHU <3
Thanks fam!!!
Hey, My TI-nspir CX CAS is 4.0.3.29, and i wanted to install ndless 4.0. so I made a file named “ndless” and pasted files: “ndless_installer_4.0.3_cascx”, “ndless_resources”. After I opened the “ndless_installer_4.0.3_cascx” file and pressed Ctrl+W, and it poped out to main menu but the green words on left top corner was missing. I have tried several times but it just don’t work. So, I thought it was not supose to have green words. So I went ahead and downloaded and moved the gba emulator and game DOS files. But it still wont work. PLEASE SOMEONE HELP
I don’t know what to do because I have 4.4.0 and I can’t downgrade