I cannot boot Ubuntu installed alongside with Windows 8.1 on my laptop with UEFI (Sony SVP1322R4RBI).

I followed the instructions on dual boot Windows 8 and Ubuntu, tried Boot-Repair with «recommended repair», then I manually set {bootmgr} option using Windows bcdedit, both

bcdedit /set {bootmgr} path EFIubuntugrubx64.efi

and

bcdedit /set {bootmgr} path EFIubuntushimx64.efi

But there is no any effect, the laptop boots directly into Windows.
Here is the report of Boot-Repair http://paste.ubuntu.com/9616775/

Maybe some advanced options would be helpful...

UPDATE 01

Here is my UEFI BIOS screens: link to dropbox (I cannot post images)

I've tried all F-keys, but I can't load boot menu.

Solved

I've renamed grubx64.efi into EFIBootootx64.efi, now everything is ok! As I understand, some models of Sony VAIO use only bootx64.efi bootloader.