What, exactly, do "we" think the software update does??
I bought and fitted a vertical detachable one from these guys (I fitted it myself on the front drive)
https://www.umbrarimorchi.it/en/
Bought it through eBay and it came with free - well, included in the price - delivery from Italy.
I used genuine Volvo electrics (no brainer)
The towbar looks good, fitted easily and works fine - without any software updates.
Cheers
Dave