I have just tried to install Ubuntu and run parallel with WIN8. As I wanted to adjust the new Ubuntu partition, I used the something else option while using the USB thumb drive with the Ubuntu install files. Then I created a ext4 and SWAP partitions. After I click continue, it warned me about the reserved BIOS area thing. I made a big mistake that I changed the EFI partition to reserved BIOS area. After that, I can only boot Ubuntu but not windows8 anymore. What can I do to fix it? Thank you very much!
PS: I tried boot-repair and it didn't work, here is the link paste.ubuntu.com/67211481 The sda2 should be the UEFI partition.