Firmware replacement

[Jacob Wall]

Have you tried a factory reset on your calculator?

This can be a bit tricky:
1. Hold down the three keys with alpha letters C, F, and O simultaneously, then use a paperclip in the reset hole on the back of the calculator.
2. Release keys and then paperclip
3. You should see a diagnostic menu, select 4. FLS Utility
4. Select 3. Format Disk C

I have seen calculators start doing weird stuff that point to something going bad in memory perhaps, almost always the factory reset fixes those types of problems.