I have a dual boot with Windows 8 and Fedora 20. Since 2 days ago, it worked well, but actually I rarely use W8. I booted briefly on it and it decided to install some updates, which made Windows booting directly, and I no longer have access to Grub.
I tried many things to recover it, I reinstalled grub2 using a chroot, I tried to wipe completely the EFI partition and restore it (it didn't change anything of course), without success. Windows still boots directly. I tried many things, even changing the "{bootmgr}" variable using bcdedit on Windows to refer to "\EFI\fedora\grubx64.efi" (I tried many different paths, no success).
The last thing I wanted to do is reinstall completely Fedora (and keeping my /home, since it is on a different partition), but the installer won't let me :
You have not created a bootloader stage1 target device.
You have not created a bootable partition.
It seems to be a known bug, yet it worked when I installed my system. My disk uses GPT as partition format.
My laptop is a Sony Vaio Pro, which is known to have bootloader problems (I can't find the link that described it, sorry), yet it worked out of the box with Fedora 20 (that wasn't the case with 19).
I hope to finally find a solutio, I'd like to avoid complete wipe of the disk (even if most of my work is saved/versionized, I don't want to reinstall everything).
Thank you in advance!