To update the BIOS on your Acer Aspire ES1-512 for free, you should only use official files from the Acer Support Website

– included in the ZIP’s readme.txt .

Downgrading can cause boot issues if the newer BIOS updated the EC (Embedded Controller). Only downgrade if explicitly instructed by Acer support.

press the power button, close the lid, or unplug the charger while the update screen is visible.

If you are actually looking to perform this update, you should only download the files from the Official Acer Support Website by entering your SNID or model number to avoid malware.