In order for me to get you the right OS version we need to look at your application version. This can be found the same way you found the Bundle version. Options -> Device ->About Device Versions. It will say something like v188.8.131.526. Did the vendor request that particular bundle? It would also help if you gave the Bluetooth make and model.
Not sure about Bluetooth model it says here Micro Edition Bluetooth Version 1.1. The car is a Land Rover Discovery 4 and they use a Nokia Blue tooth module I think. But land Rover have told me that they have only developed software up to v6.0 Bundle 2391.