How did I update the OS of my TI-nSpire CAS+ ?

Hello, I am new to the page, I just purchased a TI-nSPIRE CAS+
attached information:
Version 1.0.554
2006-08-28
I would like to know how to update the OS from scratch, I was reading the forums but I don't understand many things, I would appreciate your help, thank you
P.S. No PC linking software detects it, it only sounds like it was connected but it does not detect it.
attached information:
Version 1.0.554
2006-08-28
I would like to know how to update the OS from scratch, I was reading the forums but I don't understand many things, I would appreciate your help, thank you

P.S. No PC linking software detects it, it only sounds like it was connected but it does not detect it.