Need help: Partition order windows UEFI

Oh, my. 

Did you believe that grubx64.efi is a BOOTSECTOR? 

I guess you should think also about shimx64.efi, consult this (long) page:

http://ubuntuforums.org/showthread.php?t=2147295

and this one:

http://linux.about.com/od/LinuxNewbieDesktopGuide/tp/3-Ways-To-Fix-The-UEFI-Bootloader-When-Dual-Booting-Windows-And-Ubuntu.htm

Basically, dual booting on UEFI is a total mess, depending on single machines/firmwares and specific version of windows (and *what not* ) but, as you found out, normally you cannot add a multi-boot entry for Linux/GRUB2 to Windows BOOTMGR BCD on UEFI, you need to make GRUB2 (or Refind, etc.) your main bootmanager.

jaclaz

Oh i'm do not know about osloader or bootsector in bcdedit command. I think that grubx64.efi just like grldr but grldr config menu.lst, grubx64.efi config grub.cfg.

I try with bcdedit add grubx64.efi before but no luck. Not remember exactly what error, but it fail on windows boot manager, I will try again and will report detail error. tks for your given links