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I have tried everything I know.

I did, and at first I thought you were unable to find the doser on your USB connection. So I shared what I did when that happened to my doser maxi.

Use system manager to locate the USB connection and check that your computer is able to see the device. If it shows up in the com port, the device should be recoverable.

Use GCC to do a reset. That should restore your access. I'm having trouble with a doser and my network as well. I had to make adjustments in my router aka fiddle around to get my profilux to work....