Download Customized grub

https://www.firewolf.science/wp-content/uploads/2015/04/EFI-shell.zip

Configurations in BIOS

1. Disable Secure Boot.
2. Boot from the downloaded grub file
3. Check the value of 0xD8: setup_var 0xD8
   • If the value is 0x01 SST is on already.
   • Otherwise the value should be 0x0 in default.
4. Enable SST: setup_var 0xD8 0x01.
5. Make sure the value is changed, then reboot.
6. Re-enable Secure Boot.
7. Poof! You’re all set.

Caution

XPS 15 9560 is not suitable for this guide! Go here and open the spoiler.

Tips

For every motherboard this procedure is only required once.