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Denon-Heos-AMP HS1 flashes red continuously after a factory reset that fails.

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Problem with Denon-Heos-AMP HS1


After a factory reset attempt that fails, the following problems occur.
The unit worked just before the factory reset!


The device tries to update the firmware automatically (online), but it fails.
The device then flashes red continuously.

According to the service manual, the only option is to load a new factory firmware using a USB dongle.
After many hours of searching the web, I have not been able to find this firmware file.
The service manual refers to an SD (service disk).
The Denon service office does not sell or provide service application software.

I hope for further information/help to solve this problem
Regards Mogens