Hello! My Casio FX-9860GII seems to have a problem. In class we had to reset our calculators main memory, and mine seemed to get messed up. Now on the RUN/MAT(1) screen, it shows a rectangle where the cursor use to be. The AC/on button no longer clears the screen as well. I now have to press f2,f2,f1 tp clear the screen. Also the carrot button for exponents shows a rectangle where I put the exponent. After it is inputted I have to move the cursor down to go back to the equation after inputting the exponents.
I downloaded the OS from the Casio website but it said my calculator already had that version, so I couldn't re flash it. How can I get my calculator back to normal.