maybe you can help me out.
Macbook Pro Retina 2015 13 i5
Akitio Thunder 2 (power via barrel plug)
Corsair VS350 (till my da2 arrives)
Zotac GTX 970
1. The first time i installed bootcamp and tested the egpu, everything worked and seemed fine. I got 1450 points out of heaven unigine benchmark. After some restarts and the use of the optimus setup the egpu stopped booting my windows. (black win 8 spinning screen)
2. I thought it has to do with the efi mod provided in this thread...so i tried to revert it back (the efi backup copied it files, but the grub loader stays in the efi.) So i decided to format my machine with a time machine backup. After that i found out my Setup worked in Windows with the following boot order. [1. Turn on the psu | 2. Activate the macbook with alt. | Put in the thunderbolt cable, wait 5 seconds and boot ].
With that boot order i can boot and enjoy games (The windows logo appears. Never happend before in the windows loading sequence). But the performance is now quiet low. Guess to missing optimus? I only get 1000 points out of the heaven unigine benchmark.
3. And now to the point where i'm stucked again. I tried to install again the efi mod. After the installation of the efi mod my boot order from "2." isn't working anymore. The "revert back try" is doing the same again.
I'm a bit frustrated and i hope one of you guys can help me out.
1. If I boot into Windows and then plug the egpu in the system crashes.
The script in the beginning post to revert back is not 100% correct I guess -> i tried it that way.
sudo mount -t msdos /dev/disk0s1 /Volumes/efi
hdiutil attach ~/Desktop/EFIBackup.dmg
ditto -V --norsrc /Volumes/EFIBackup /Volumes/EFI
has to be:
ditto -V --norsrc /Volumes/"Efi 1" /Volumes/EFI
Efi 1 is the volume name of the copied efi in the "EFIbackup.dmg".
sudo diskutil unmount /dev/disk0s1