[REQUEST] Roll Back M1503QA Bios

[daniel1018]

Hi everyone, I need help in rolling back my bios from version 311 to version 309. I already tried using EZ Flash and WinFlash but they wouldn't work. EZ Flash claimed that the selected file was not a proper bios when I tried to flash version 309, but I downloaded the file from Asus Support. If I tried flashing the version 311, it works. Thank you in advance.

My laptop model is ASUS Vivobook 15X OLED M1503QA. Current bios version: American Megatrends International, LLC. M1503QA.311, 11/10/2023.