Astak R4020A - User Manual - Manual (Page 73)

72
Upgrade Firmware
You can upgrade the firmware in this page if you have a new version.
Item Description
Firmware Version You can see the firmware version of this device.
Select File
Click the button to select the firmware on your
disk, and then click the button to execute it, or click
the button to clear the path information.
When upgrading firmware, please wait 111 seconds until
completed.