I've been trying to install Windows 10 on an early 2011 Macbook Pro. It's not officially supported, but I read everywhere it can be done. There are some troubles though.
I have successfully installed it alongside MacOS High Sierra actually, and everything works fine except for audio. I get the exclamation point on Device Manager and a message saying the device couldn't be started properly.
I found out audio doesn't work because Uefi Windows 10 installation somehow keeps a Cirrus audio-related device from working. At least that's what I understood after googling myself to death.
So I tried to install Windows 10 in Legacy/Bios mode. I chose "Windows" for the setup DVD instead of "Uefi Boot" at boot.
But just before the point where Windows usually asks which disk to install on, it actually asks for a missing driver. This doesn't happen when installing in Uefi mode. I tried feeding it Intel xHCI drivers with usb keys, it sees the keys but says it doesn't find any driver.
So I was wondering, is this behavior due to the fact the disk is partitioned in Uefi mode? So is it impossible to install Windows 10 in Bios mode in such a setup, or am I instead missing something?
NOTE: I wasn't able to use Boot Camp and had to prepare everything by hand, since I don't get the option to install Windows 10 from Boot Camp, only 8 and 7. If I try to install Windows 10, Boot Camp says the OS is not supported.