Cube root won't completly graph on ti-nspire cx cas

How about starting a new document, or adding a new page, or just turning the machine off without saving?

At first press on key, then Settings and finally Document Settings. From this menu on the position Base choose Decimal. See captured image below

Have the TiNspire Computer Link installed on your computer.
Download the OS from from education.ti.com
Connect your calculator to the computer with TINspire Computer Link. Run the software. It opens an explore type window. Under the TOOLS tab find Install OS. If it does not connect to the Internet, point the software to where you stored the downloaded OS.

Unplug the battery? I thought that the battery was built in.

Press Documents Settings. On line angle select radians, AND validate the change by moving the cursor on the OK button, and pressing it.

See captured image below

For the TI-Nspire and TI-Nspire CAS handheld units with TouchPad and
the TI-Nspire CX and TI-Nspire CX CAS:

• Hold down [doc] [enter] [EE].
• While holding these keys press [on].

Please Note: For TI-Nspire Family handheld units that
contain rechargeable batteries you can alternatively hold the above
keys while pressing the [reset] button on the back of the handheld rather than
removing the battery for 2-5 seconds.

• The device will boot up as in the previous reset, but will display a menu
with the following options. Please try options 2, 3, and 4 in that order.
• 1: Cancel - The most non-intrusive reset option; no changes are made, the unit
restarts.
• 2: Delete Operating System - The operating system will be deleted
without deleting any documents on the system.
• 3: Delete Document Folder
Contents - This will delete the user's documents, but will not delete the OS.
Selecting this option is the same as using the RESET hole on the back of the
unit.
• 4: Complete Format - This will delete the OS and all documents for a
total wipe of the handheld.

Please note that the second and fourth option will require that the OS will need to be reinstalled.

A result is too large to fit the memory. Number is infinity.

I have a doubt, when I choose to completely format the calculator it will clear your operating system, files saved on it, but the product key (ID protuto) will be deleted too?

I do not see why it would do that. Maybe you restricted the domain to positive values of the independent variable.
Anyway, my CX CAS has the latest OS version and it draws cube root for positive and negative values of x.
By the way the cube root is made up of one branch only, not 2 like the square root.
Here is a screen capture.