Question Asus x441ua bios flash back to older bios impossible?

Apr 1, 2024
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laptop model : Asus Vivobook X441UA
BIOS Version : 320
Bios build : march 10 2021.

so am quite sure my dad flashed the bios to this unknown 320 version that appears NOWHERE on every single support download pages of the official my asus app and asus website.
currently the most recent bios version on the download page is Bios version 316 from april 17 2019
this bios version 320 doesn't let me flash back to 316 bios, because its "too old"according to the ASUSTeK Easy flash Utility from bios settings.

my question is how am i supposed to force a flash back to bios version 316?