You should actually forget OS 3.9 which doesn’t bring anything interesting for users expect the usual anti-Ndless/anti-downgrade protection.

Get the new DowngradeFix 3.9 to uninstall OS 3.9 and (re)install OS 3.6, compatible with Ndless 3.6, the TI-Nspire calculator jailbreak. Make sure to follow all the steps described in the tutorial.

Many thanks to the usual enthusiasts who worked  hard on it behind the scenes.

You will now be able to try out the Ndless-powered MicroPython port and its PyWrite editor. Python is an interesting alternative to Lua and the #1 programming language for learning programming.

downgradefix 3.9