Yes it's a software upgrade. Your Volvo dealer can install it for a significantly large amount of money (It was about £300 when I asked)
https://accessories.volvocars.com/en...CC-449351/2008
Or VDash can do it for £60 but you will need to find someone to read out your CEM pin first (which will be an additional cost).
https://d5t5.com/wiki/vdash/article-pricelist
I'm playing around with editing the CEM configuration table in it's internal software and seeing if it can be enabled that way, but haven't yet figured out how to re-calculate the checksum.