SwissMicros Calculator Forum

You need to put the CPU in bootloader mode.
Open the calculator, press and hold the boot0 button, the press and release the reset button, then release the boot0 button.
Now try the dfu-util

Screenshots aren't possible, but perhaps the console displaying the LCD content might help.

Very nice. Congrats!
I've been thinking of this too ...

True. The DM41 is not affected by this issue. V30 is perfectly fine for DM41L/DM41

Thanks for the flowers!

which design?

The DM10L will have the same price as the DM15L ...

Unfortunately it'll take at least a month or two for the new foils to be finished.
We'll post the availability and how to get them here in the forum.

The problem has been identified. It seems the metal sheets from which the metal domes were stamped weren't cleaned properly. An oil film prevents reliable contact. The domes and the contact area on the PCB can be cleaned, which significantly improves the reliability. We encourage anybody having such...

The battery voltage drops under load. The more load, the more the voltage drops. The higher the CPU frequency is, the higher the load, the lower the voltage. But the voltage rises again after taking the load off. A low battery icon is displayed somewhere around 2.2V. The LCD starts fading at about 2...