Firmware replacement

[Slavomir_Cerny]

(08-25-2021 03:15 AM)Jacob Wall Wrote:  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.

Hi Jacob,
thanks, but it did not work. No diagnostic menu appears, I see only x2+y2=1 instead.
My HP Prime is G1.
In fact what I need is just to downgrade the firmware from 2021-05-05 version to 2020-01-16 as the bug reported in 05-05 disables the functionality of the calculator pane for the G1 calculator version.
I am almost crazy. Nobody except you helped me.
Once more thanks.
Old idiot (81) should not use modern facilities.
Slavomir