how to install a old SO of texas ti nspire?

→ **MyCalcs** profile · by **cristhianlt** » 09 Sep 2019, 07:52

I did not know that I was going to have several problems when updating the texas ti nspire cx cas calculators to its latest version, now I have problems because I need to install ndless to handle some programs, as I could install an old system. Thank you for your time.

→ **MyCalcs** profile · by **Lionel Debroux** » 09 Sep 2019, 07:55

What did you do exactly ? IOW, which OS version your calculator is currently running ?

→ **MyCalcs** profile · by **cristhianlt** » 09 Sep 2019, 08:00

Lionel Debroux wrote:What did you do exactly ? IOW, which OS version your calculator is currently running ?

the version is 4.5.1.12

→ **MyCalcs** profile · by **Lionel Debroux** » 09 Sep 2019, 08:04

Then it's too late: your calculator cannot use Ndless anymore until a fresh security hole is exploited to give access to native code again, which also includes removing TI's anti-downgrade protection.