boot camp 6.0

My iMac (14,3) is with 4 partitions SSD 1. with windows 8.1.

Then 1GB Hard disk with 2. Maverick 3.Windows data 4. Recovery. Via boot camp I can boot 1. and 2. I configured the boot camp manager in such a way that it boots windows (I am 72 years old and I am not capable anymore to use a new operting system really well!) That is the raeason why I put windows on the SSD, which I know is not the standard with Boot camp Manager software.

Then the following was done:

1. I upgraded on Windows from Windows 8.1 to 10. Everything worked fine until I tried to to connect my Android tablet to my iMac. I found out that the Bluetoth driver was not installed. I tried to update the driver, but windows gave up.

2. I tried to find a solution, which I thought I found on: Use Windows 10 on your Mac with Boot Camp - Apple Support.

3. I followed the instructions for upgrading to windows 10.

4. Therefore I updated my Maverick to Yosemite and some other updates which where installed from the App Store.

5. I ran then in Windows the Apple Software update. iTunes and Quicktime where updated, but no new drivers or a new version of boot camp - it still is 5. something.

6. I went back to Yosemite and ran the boot camp utility and opted for item 2 only, i.e. only an update of the boot camp itself and saved it to an usb stick.

7. I booted windows 10 and tried to run the BootCamp.msi which is located under Bootcamp -Drivers- Apple on the usb stick.

8. Windows told me that it would not run the msi, becacause I needed more rights, I should run setup.exe instead which was located on the USB stick under BootCamp.

9. That failed as well.

10. I then installed the drivers manually by running the exes in BootCamp-Drivers- Apple for the mouse and the camera. But I could not find the drivers for bluetooth.

11. I then went to the windows device manager and selected the USB driver with the yellow question mark and updated the driver by telling windows to look on the USB stick. It found the driver!

This sounds like a success story, but not quite as the boot camp manager now does not accept anymore that I boot by default to windows. The only way I can get there is by pressing alt during bootup and select Windows. That is not very convenient. ( and the bootmanager displays all 4 partitions as bootable!)

I know this is a pretty long story for an inconvenience, but my experience might save somebody a lot of experimenting.

But:

DOES ANYBODY KNOW HOW TO FIX THIS INCONVENIENCE AND GET THE BOOTCAMP WORK CORRECTLY?