I must first apologize for the endless flow of unanswered requests for updates.

The long awaited Ndless 4.0 is out thanks to the hard work of the team, compatible with OS 4.0.3. It will let you run native programs on the latest TI-Nspires. The installation (and reinstallation on crash/reboot) does not require to be connected to a computer for a smoother experience.

Get Ndless 4.0.
Follow the installation guide.
Load your TI-Nspire with native programs (maybe crafti or MicroPython?)