How to upgrade car radio?
Not sure anyone here would be able to help. You should go to a C3 forum. This is for the C3 Aircross SUV which is substantially different and, as it is a new car only released end of 2017, there are no old models.
Try www.citroenc3owners.com
Try www.citroenc3owners.com
Orange 110bhp Feel with City and Family packs.