TI-Nspire CX II-T Boot Loop

[Smanyo]

Hello Everyone.
I have a huge problem with my TI-Nspire CX II-T CAS.
I used it a bunch of month a go and it worked without any issues. When i got it back for an exams in those days, plugging it in the USB cable to charge it started boot looping. The loading screen with the bar shows up then the home screen is seen for half a second not completely loaded and then the loading screen returns, and this keeps repeating.

I thought it could be a just because of low battery so i left it to charge a whole afternoon, but nothing changed. I also tryed the reset button on the back but nothing seems to change.
When it's plugged into the PC via USB port i can't see it anywhere. I tried to delete the file system and i was willing to try deleting and updating the OS via USB, but as i can't see any device liked i don't knwo what to do.

Has anyone any suggestion ? I have an exam in a bunch of days and the calculator is really needed.
Thank you in advance

[critor]

Hello.

A boot loop indeed is normal when the battery is too low.
It should disappear by itself during the charge (after some minutes/hours, depending on the battery level).

Maybe the battery is faulty... and maybe it's something else.
Does the calculator still turn on with the USB disconnected ?