Acer Aspire E1-521 Service Manual page 56

On the target machine, insert the USB disk and reboot the computer.
6.
Boot into DOS using the USB disk.
7.
Execute the batch file. At the command prompt, type UPDATE.bat and press Enter to update
8.
BIOS. Flash process begin.
Flash is complete when the message Flash complete! is shown.The system restarts
automatically when finished.
2-15
Figure 2:15. Booting into DOS
Figure 2:16. Updating Flash ROM Blocks (1 of 2)
Figure 2:17. Updating Flash ROM Blocks (2 of 2)
System Utilities