AVITA LIBER V - AMD Ryzen™ (14-inch) laptop cant flash back backup of bios

EDIT: Correction and my apologies…hello dear community, ill resume my issue…

So i have an Avita liber v 14 laptop (NS14A8) with an amd ryzen 5 3500u apu. i been recently trying to mod its ami aptio V bios to unlock extra features. But i always ended up with code 18- secure flash verify fail error. So instead i used smokeless UMAF to see if it can do some tweaks but somehow i ended up with an issue where now i cant disable secureboot because vendor keys got modified (Secure variable update is locked down)

Now im trying to flash back the original rom (which i made a backup of beforehand) but it ends up with code 18 error as usual. The problem is this company has never released any of this laptop’s bios files, not even a single update so the only rom file i have now is this backup i made and i cant seem to flash it. I want to know if i could disable this security check and flash the rom

Thank you.