I am sure you are right. The basic function ie lights should work straight away and you only get the full functionality when you have had the software downloaded at a dealer.
There was a thread on here a while back that said that you had to deregister the module from the donor before you could use it on another vehicle.
You have made a good saving on the towbar so bite the bullet and buy a genuine Volvo module to get the full functionality.
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XC60 2013 D5 215 SE Lux Nav geartronic
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