If you follow us, you know you can safely optimize the free space on your TI-Nspire with 2 different ways :

• by removing useless boot2 files and the examples present in the non-signed part of the OS install file, which is possible on the computer before the installation, with TNOC for all the OSes or on the calculator after the installation, with the ndless program nTNOC
• By removing the useless resources the Nspire OS uncompresses in the filesystem duing its installation like the TI-84 ROM, ths skins, or again languages, which is possible on the calculator using the ndless program nCleaner

On recent OSes, TNOC/nTNOC allows you to gain 3MB of free space.

nCleaner however only existing as an Ndless program, it was only possible to combine it with nTNOC under the OS 3.1 for an additional saving and an extraordinary free space available:

FYI, the records so far are :

• 19.7MB of free space with OS 3.1 on the Nspire (TNOC + nCleaner)
• 20.3MB of free space with OS 3.1 on the TI-Nspire CAS (TNOC + nCleaner)
• 16.1MB of free space with OS 3.2 on the TI-Nspire (TNOC)
• 18.4MB of free space with OS 3.2 on the TI-Nspire CAS (TNOC)

As you can see, because of the absence of a Ndless version compatible with OS 3.2, this OS couldn't be as optimized as 3.1

But thanks to nLaunch, these times are over !

Indeed, nLaunch is an OS Launcher for the TI-Nspire ClickPad/TouchPad, which even accepts modified OSes ! 
It comes with a computer tool, "BuildOS", which allows you to "rebuild" an Nspire OS install file from its extracted resources.

So, instead of removing the unwanted resources once extracted in the filesystem, let's remove them all beforehand, on the computer, in the file itself !

As a bonus, it actually makes twice the free space because this OS file, not only not extracting useless resources, will be lighter !

So, this is feasible on any OS, whatever their Ndless support, so, as much on the 3.1 than on 3.2


So, let me now present to you the new world record for the CAS 3.1 OS which previously peaked at 20.3MB of free space...

And this time, it's different, since even the 3.2 OS can benefit from this extra free space !



Unfortunately, for obvious legal reasons of copyright etc., we cannot publish such modified OS.

On the other hand, before using BuildOS, you'll have to correctly  uncompress/decrypt the Nspire OSes. Some tool was available years ago for that but hasn't been publicly updated for OS 3.X.

Fortunately, Excale found a workaroung using only nspire_emu!
Thus, you too can modify your TI-Nspire OS! You can either remove useless resource, or craft extraordinary patches!


Source with the OS nspire_emu decryption tutorial:
http://tiplanet.org/forum/viewtopic.php?t=11026&lang=en

IPS patches are not appropriate for compressed/encrypted images (when the modified file size can be different).
In case of files with different size, the IPS patch is going to include all code which will have changed location in the file, and so there will be a copyright problem.

IPS patches are appropriate for raw images - so you'll need to decrypt/decomprress and encrypt/recompress your OS installation file anyway.

I updated the tutorial with a batch (still require 4 external programs), plus clarified some parts for those interested.

Optimize your OS now: http://tiplanet.org/forum/viewtopic.php?f=57&t=11027&lang=en  .