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I also didn't downgrade. But I set both door unit and indoor display to factory setting (via WMS tool in PC). And started configuration as new devices... Now both work good

I did it on the tart of this week, but without changing. So I did it once again yesterday evening and it works. Thank you.

How did you downgrade? Only upload older FW version or different way? Thank you for information

Hello to all, I have installed DS-KD8003-IME1, till last week worked greate. After upgrade to last verion of FW the button on Door station says: "The calling was not successful. Do anyone have idea what can I do, please? I tried to restored to default setting both - door and indoor station. But...