hp41cx reset not possible

[Uli]

(12-18-2022 10:50 PM)Joe Horn Wrote:  

(12-18-2022 09:10 PM)Uli Wrote:  I followed the procedure mentioned by Joe.
Display shows: 0,00000..................00
and on the button a very small "0".

On the BUTTON or on the BOTTOM? If the very small 0 is at the BOTTOM of the display, that means that flag 0 is set. So now please try this exactly as shown:

With the calculator turned off, press and hold down backspace, then press and release ON, then release backspace. The order of pressing the keys is important. Please let us know the results.

Oh sorry. BOTTOM is correct.
I made the test. Nothing happened. Display is dead during this test. It is not possible to switch the calculator on , after this test.