Aporte original por: Michael Stefanchik ,
You cannot simply flash the CX CAS firmware to the CX calculator so you may have bricked the calculator. If you haven't already tried: unscrew the battery cover and remove the battery; while the battery is the removed press and hold the reset button down (using a pen, paperclip, etc.) for around 10 seconds. Put the battery back in and let us know if it works!