Forum TI-Planet.org

Updated my CX non-CAS to 4.5.2 (1st Mar 2021), now I can't downgrade...

Help, please need help.
I had the CX non-CAS from a long time ago but I am used to updating it regularly which all went fine ( I had formatted it once before 3 years) .

Now I need urgently to use CX CAS on my CX non-CAS. So, I said "Ok, I'll just downgrade"... but I can't. The Ti-Nspire computer link software says I can't install an OS older than the current OS .

So... Is it possible to downgrade to 4.4 or lower & install CAS in this Calculator??
if it's not yet possible please just give me hope it will be soon...

Here is some information that might be useful:
Ti-Nspire device information says
Device type: Ti-Nspire CX
OS version: 4.5.2.8
boot1 version: 3.0.0.99
boot2 version: 4.5.0.14
On the back of the calc, it says 2179001071 P-####E

Hi.

Yes, there is a way. You can :

• update to 4.5.3 and then install Ndless : viewtopic.php?f=57&t=24267&p=256110#p256110
• add and open the BtMg.tns file on your calculator : archives_voir.php?id=10080
• from the BtMg home screen, press

  5

  7

  to reset the minimal allowed OS version to 0.0.0
• exit BtMg with

  0

• then immediately send the older OS version you'd like to install

Tank you Critor you save my life thnk you its working well

after downgrading I installed the Nspire CX CAS OS 4.4.0.532 and working well

thank you again

really this site is the best site I ever deal with I got the help within one Hour

Thanks for confirming it worked.

You're welcome.