Acer Aspire Es1-512 Bios Update [2021] Here

: For older ES1-512 units, ensuring a healthy CMOS/RTC battery is recommended to prevent flash errors.

The boot loop was gone. The laptop booted into Windows quickly and ran stable for weeks. Maria later added an 8GB RAM stick (previously unsupported) – it worked flawlessly. acer aspire es1-512 bios update