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Go to http://www.doro.dk/support/. Scroll down and on the right hand side, open VOIP-Downloads. Get the DoroUSBPhone_635ipw_1,1,016.zip file. Haven't checked if it actually works, but at least it's a start :-)
Well, then you have a Partner ACS. Go to the phone system, in the center of the 5 slot carrier, is the processor. You will see on the bottom, there is a grey cover, with a black poece that slides up. Slide black piece up and pull out the battery holder. Replace the batteries and reinstall. Make sure you do all this while power is on, as the programming will be lost if it loses power, those batteries keep programming if the power is lost.