Acer Altos G540 M2 - Manual (Page 212)

Appendix C: Altos eXpress Console 204
To upgrade firmware:
1 On the Maintenance page, click Enter Update Mode. The Firmware
Upload page appears.
Note: You will not be able to perform any tasks until the upgrade
is completed and the device is rebooted.
2 Click Browse to locate the firmware image file.
3 Click Upload to upload the image file to the server.