I followed the instructions to make the ti nspire cx to cas. Now the calculator is showing me a message saying "this calculator has been modified to enable CAS functionality...." I tried [esc]+[menu]+[-] and rest. It would reboot and show a message that the operation system is not found. I tried couple time to install the original operation system but it would reboot again to the message "this calculator has been modified to enable CAS functionality..."
Please help me fix this.. what should I do?