Thanks for your reply! However, I do not really get, what your solution is by using the eFlasher tool.
Do you mean to compile and flash our own version of Android? What needs then to be done differently to the stock Android to get the bluetooth working?

Thanks for any advice!

Same problem here for me! It is crashing constantly and the popup window that keeps opening all the time really is annyoing.

Hope there will be a fix soon.