There is an “TI-nspire CXII connect” web app from Texas Instruments themselves. You can find it by going to the webpage of your calculator, and then going to the software section (https://education.ti.com/en/products/calculators/graphing-calculators/ti-nspire-cx-ii-cx-ii-cas/software-overview). If you scroll down far enough (past all the teacher/student software) you’ll see a small section about nspire connect. This should lead you to the following website: https://nspireconnect.ti.com/?ref_url=https%3A%2F%2Feducation.ti.com%2Fen%2Fproducts%2Fcalculators%2Fgraphing-calculators%2Fti-nspire-cx-ii-cx-ii-cas%2Fsoftware-overview. This should allow you to update your OS, send and receive files, etc.
There is an “TI-nspire CXII connect” web app from Texas Instruments themselves. You can find it by going to the webpage of your calculator, and then going to the software section (https://education.ti.com/en/products/calculators/graphing-calculators/ti-nspire-cx-ii-cx-ii-cas/software-overview). If you scroll down far enough (past all the teacher/student software) you’ll see a small section about nspire connect. This should lead you to the following website: https://nspireconnect.ti.com/?ref_url=https%3A%2F%2Feducation.ti.com%2Fen%2Fproducts%2Fcalculators%2Fgraphing-calculators%2Fti-nspire-cx-ii-cx-ii-cas%2Fsoftware-overview. This should allow you to update your OS, send and receive files, etc.