Hi

Since I updated my W810i phone by using SonyEricsson update program the bluetooth function doesn't work with my car radio any more. Called Pioneer and they confirm this problem. SonyEricsson seems to changed something in the bluetooth module or something?
So now I want to downgrade/rollback to a older firmware, is this possible?
It's a Vodafone Swedish phone with the firmware R4DB005.

How much does it cost for all software and probably hardware which I need?

Thanks in advance.
Kensy