Does not allow RPN anymore

The update defaults to ALG entry. The iTunes info states the 12C classic only operates as RPN and the Platinum model allows a choice between ALG adn RPN. However, I cannot find a way to go back to RPN in either mode. Why mess with my choices with a update? How can I get RPN back? No links or Internet support from developer. #fail!

Success_Is_A_Choice about RLM-Fin-CX, v6.0