TI Nspire CX Stuck at 60% Boot

[critor]

after doing the first key combo, it gave me a 0% bar with a gear and a yellow triangle

You mean ?

It would mean you have no bootable image in the Diags partition.
And since the Boot2 partition doesn't seem to work either, the USB/TTL interface looks like the only way out.

[Ner027]

On the picture you sended it looked like an FTDI breakout is it something like that?