BIOS update on Asus without battery

I have an Asus laptop (model ASUS ROG zephyrus S GX531GWR) running GNU/Linux (Debian Stretch) with a non-functional battery and I want to update the BIOS. How can I update the BIOS without WinFlash and EasyFlash? I don't use Windows, so I can't use the WinFlash utility from Asus the battery doesn't work, so I can't use EasyFlash (it requires a battery charged to at least 20%) I'm used to updating the BIOS using FreeDOS. This works fine when the BIOS update is an executable file. However, the BIOS from Asus are displayed as data files (I downloaded GX531GWR-AS.305). Edit: The reason for updatin

Question by Kulio on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.