Dualboot Mac/windows installation issue

27'' iMac late 2015 (2TB Fusion; i5 3.3GHz; m395)
Boot Camp Assistant 6.0.0 (519)
Windows 10 US Home + Professional - 64bit downloaded directly from Microsoft

1) clean installation 2TB fusion, only one data partition + one swap (invisible by GUI disk util) as preinstalled by Apple
2) run boot camp assistant, select windows 10 iso, it creates 2 partitions (OSXRESERERD ~8GB + BOOTCAMP ~300GB)
3) automatically restarts into installer
4) select clean install (advanced)
5) locate Bootcamp partition
6) observe error: "Windows cannot be installed to this hard disk space. Windows must be installed to a partition formatted as NTFS."
7) press format
8) press next
9) observe second issue: "We couldn't create a new partition or locate an existing one. For more information, see the Setup log files."

10) delete bootcamp partition
11) press next
12) observe third issue: "Windows detected that the EFI system partition was formatted as NTFS. Format the EFI system partition as FAT32, and restart the installation."

third one is obvious and, just for the record, second issue is the gamebreaker

luckily I managed to instal windows 8 (NT 6.2 build 9200) previously.

see https://discussions.apple.com/thread/... for more detailed message

This video was made for apple support (case 996480304)

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