The process of downloading the Acer Aspire ES1-521 BIOS 1.04 driver should begin automatically after a few seconds. If this does not occur, click on one of the links below (we recommend downloading the Acer Aspire ES1-521 BIOS 1.04 driver from the primary server - this is the manufacturer’s Acer official website). If the download still fails to run, check whether your anti-virus software is not blocking the connection to the manufacturer server of the Acer Aspire ES1-521 BIOS 1.04 diver.