Quick update: Managed to activate “Manufacturing Programming Mode” which unlocked the ability to edit “Setup” varstore 
(here is my case [REQUEST] HP Laptop 15s-gr0009au InsydeH2O BIOS unlock help needed - #4 by x0rzavi ,changes are not getting saved though) Can you try this on ur laptop too, maybe will give some unrestricted access to flashing mods?
Download this NbDmiFit-2.13.rar - Google Drive, put on a FAT32 formatted drive, launch u.nsh from EFI/Boot/ folder. I prefer to skip that startup.nsh (Idk what it exactly does)
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