1. On the left pane, click Boot Sequence

2. Figure 1: Boot Sequence UEFI Check that Secure Boot is set to Disabled

3. The Boot Sequence MBA option setting allows you to specify a method for booting from a network server.

4. Boot mode should be selected as UEFI (not legacy) within the BIOS go to the General > Boot Sequence click Apply

5. Root Sony Xperia Z on Locked/Unlocked Bootloaders With Easy Rooting Toolkit [GUIDE] then the boot sequence is fragmented in such a way that even if someone is able to get access to the bootloader , there is a two-factor authentication of the bootloader .

6. An unlocked Android Bootloader, showing additional available options Some modern CPUs and microcontrollers (for example, TI OMAP ) or sometimes even DSPs may have boot ROM with boot code integrated directly into their silicon, so such a processor could perform quite a sophisticated boot sequence on its own and load boot programs from various