Hi guys, I have a problem with my ti nspire cas touchpad (the black one). When I bought it two years ago it had the 2.1 version of the os. I don't know why, but following the update guide on the texas instruments site something went wrong. The 3.0 update installed made the handheld believe that she is a clickpad one and not a touchpad, so I have that different key mapping.
After some resets, re install, update try (now it has 3.6 os on it) i discovered on the forum that the error may lay in the boot2 installation. At that time I tried to downgrade via the serial port, following the online guides and using a b75937 usb-ttl adapter (it has a CP2102 chip on it) but with hyperterminal I didn't manage to get a connection.

Now I ask you:
It's my specific usb-ttl that it's not right for this?
In alternative I have an Arduino UNO board, could be more effective?
It's hyperterminal fault?
I read about lrzsz, in alternative to hyperterminal. I installed cygwin but I don't know how to use it, could someone explain me?

Thanks for reading