sbctl won't work on Fujtsu Lifebook A574/M, BIOS would just reset ANY USER intervention of the secure boot changes

[SUFandom]

Pointers:

• sbsign can enable secure boot, but won't allow modification on its efivar, checking the BIOS option, it only has customized or default option, as well as a switch to enable/disable secure boot
• signing efi files won't work either using this tool
• didn't use the optionrom flag as this unit is using Lynx Point, for safety because there could be a huge chance of soft bricking everything, and this bios was from 2016 (now installed the last version on 2020)
• also had custom signed keys ready, with archlinux's wiki help

[SUFandom]

Also forgot:

• used chattr, it did "work" but it just reverts itself like nothing happened (but secure boot flag did turn on)