Try to recover memory?

[franz.b]

(03-26-2019 07:32 PM)John Keith Wrote:  Also, while the custom menu is saved in a user-accessible variable, custom flag settings are not. I save my flags in a variable so I can reload them after a system restore.

thanks, I knew the procedure for the cst menu and for the user keys, but how do you do with the flags? is there a way to extract them into a binary object? (however it took me a few minutes to put them back to my taste)

(03-28-2019 01:34 AM)TravisE Wrote:  I can't say why the SD card contents would get lost, short of an accidental reformat or some sort of weird corruption. I personally never had that happen to me. I've always had it and Port 2 remain intact after a crash.

It's probably a good idea to avoid writing to flash when the batteries are low (earlier versions of the ROM would actually prevent this, but the most recent revision allows it). I use rechargable NiMH cells and keep a charged set ready to swap in as soon as the low-battery indicator appears in order to avoid any lost work from a sudden power loss. Another option is to plug the calculator's USB port into a device that provides power, at which point it will automatically operate on the USB-supplied power instead of the batteries.

I don't know, I haven't written to SD since a long time, I used it just for backup ... maybe it's a failure of the card itself that is old ...
yes I also use rechargeable batteries (Eneloop) but I think the trouble happened because the AAA batteries and the backup battery was empty at the same time and the warning is the same ... so I did not think to connect the calculator using the usb cable