Linux & Windows EFI Dualboot: dealing with hard-coded EFI entries

Hoy toca una entrada friki. Ya van dos pc bastante nuevecitos (David y Tato) que sufren de un problema: Windows+EFI.
Queriendo dos sistemas operativos, en uno o varios discos (todos tablas GPT) etc, y con EFI, windows puede ser un quebradero de cabeza.
Los fabricantes ponen links hard-coded para lanzar SIEMPRE el windows que traían por defecto. Esto complica todo. Aquí hay un tutorial que me ha servido con ambos pc

Taken and updated from: http://h30434.www3.hp.com/t5/Notebook-Operating-Systems-and-Software/Changing-Boot-Order-on-Dual-Boot-Windows-8-and-Ubuntu/td-p/2503733

On Windows:

1. Mount EFI partition: 
   
   mountvol S: /S
2. Move the windows EFI file which is hard-coded loaded S:
   cd \EFI\Microsoft\Boot\
   move bootmgfw.efi bootmgfw_back.efi
3. Update EFI entry bcdedit /set {bootmgr} path \EFI\Microsoft\Boot\bootmgfw_back.efi
   bcdedit /set {bootmgr} description "Fuck Windows"
   At this point you should get a confirmatory message of the correctly performed operations.

On Linux (Tried on Ubuntu 14.04 x64).
We would assume that you have the FAT32 EFI partition mounted on /boot 

1. remove \boot\efi\Microsoft\Boot\bootmgfw.efi and \EFI\Boot\bootx64.efi
   sudo rm \boot\efi\Microsoft\Boot\bootmgfw.efi and \EFI\Boot\bootx64.efi
   
2. Remove (if any) OS boot manager (in HP, other manufactures have other names) entry.
   # first of all
   man efibootmgr
   sudo efibootmgr
   #would give us something like
   #BootCurrent: 0000
   #Timeout: 1 seconds
   #BootOrder: 0000,0006,0005,0001,0002,0003
   #Boot0000* OS boot manager
   #Boot0001* UEFI:CD/DVD Drive
   #Boot0002* UEFI:Removable Device
   #Boot0003* UEFI:Network Device
   #Boot0005* Hard Drive
   #Boot0006* ubuntu
   #Boot0007* Windows 7
   #remove OS boot manager
   sudo efibootmgr -b 0000 -B
   #select your preferred OS entry order
   sudo efibootmgr -o 0006,0007,0001
3. Now, you need to add a custom entry on grub: 
1. First of all, find UUID of the drive:
   grub-probe --target=fs_uuid /boot/efi/efi/Microsoft/Boot/bootmgfw_back.efi
   
2. Add the entry to grub.
   # edit /etc/grub.d/40_custom
   sudo gedit /etc/grub.d/40_custom
   # add thismenuentry "Windows x86_64 UEFI-GPT" {
       search --fs-uuid --no-floppy --set=root UUID
      chainloader (${root})/efi/Microsoft/Boot/bootmgfw_back.efi
   }
   
4. Update grub
   
   sudo update-grub
   
5. Done! 

Foto (de Heidelberg para variar) y canción. Fin de acto.

Jim Hall Trio, Deep in a Dream