The microwave in my apartment also has bad firmware. It beeps four times when the timer runs down and it turns off. Unfortunately, the beeping continues unnec

The microwave in my apartment also has bad firmware. It beeps four times when the timer runs down and it turns off. Unfortunately, the beeping continues unnecessarily after opening the door. I believe Frigidaire (the brand) contracted a manufacturer to build the model, but they have their own people install the official firmware. Then the manufacturer produces extras, installs their own firmware, and sells them, cutting out the brand. And that's how I end up with a "Frigidaire" microwave that beeps when it shouldn't and says "GOOD" instead of "DONE". At least that's my theory. Firmware is an important part of the appliance. An appliance with Frigidaire hardware and third-party firmware is counterfeit. Maybe the same thing happened with your Miele appliances?