Bluetooth Driver under Windows 10 with Bootcamp

Hello,

I have an iMac 27' late 2012, running El Capitan.

I recently installed Windows 10 on Bootcamp, and everything went fine.

Except for one thing:

No matter what I do, I can't get the bluetooth module running.

Specifically, its called "Bluetooth USB Host Controller".

Code 28, drivers were not installed. there are no compatible drivers.

I tried Bootcamp 5.1.5621 and 5.1.5722 drivers.

I even tried with manipulating the driver file by adding the Hardware ID.

I even tried AppleBluetoothBroadcomInstaller64 from kb.parallels.

This is pretty sad I think, because the reason why I wanted Windows 10, was that two bluetooth headsets I tried to pair with Windows 7, didn't work.

I tried a lot of things, including different drivers, external bluetooth software. no stable solution possible, although magic mouse and keyboard worked perfectly. specifically, i tried the sony sbh20 and nokia bh111.

And another funny thing: Apple Magic Mouse and Keyboard work fine under Windows 10 (except for the scrolling function of the magic mouse).

I read the other threads. Essentially, the message was: "We have to wait for the next bootcamp drivers from apple".

Appreciate any help.