Hmm, I didn't really follow a pre-made guide. However these are the steps I followed: Undoing is done by simply removing the refind folder from the EFI partition. Some more detailed steps from a post I made from thread http://forum.techinferno.com/implementation-guides-apple/8717-%5Bguide%5D-enabling-intel-iris-pro-hd5200-win8-1-15-macbook-pro-gt750m-4.html