Solution 12117: Cause of the Signature Error on the TI-89 Family, TI-92 Plus, or Voyage™ 200 Graphing Calculators.
Why am I getting a Signature Error message when sending the operating system to a TI-89 family, TI-92 Plus, or Voyage 200 graphing calculator?
When sending the operating system to a TI-89 family, TI-92 Plus, or Voyage 200 from a computer, the calculator must be on the Home screen. The signature error
message will appear if the calculator is put in Receive mode. The only time the calculator should be put in Receive mode is when the code is being sent from another graphing calculator.