i've used GB 0.27, 0.29 with the rtl fix and 0.30 - all of them managed to connect to MB3. never smoothly, always had to disable bl & renable . it connects - but badly & doesn't keep connection alive after phone goes into "sleep".
also, sometimes it's connected (i can send test calls) but it still says connecting
also, sometimes it's connected (i can send test calls) but it still says connecting