To apply the update through the front-panel USB port:
Download the update file (de551_1.0.2_to_1.0.3_r3.tar.bz2) to your computer.
Copy the file to a USB flash drive
Insert the drive in the front-panel USB slot of the encoder.
Go to System Setup | Update on the front-panel LCD menu and press OK when the name of the update is displayed.
The update should take 1-3 minutes; when it is complete, the encoder will power off. Please do not power the unit off yourself before this occurs.
Remove the USB drive and power up the unit.
Once the LCD screen indicates that the update is complete, press the X button to return to the main screen.
To apply the product update through the DE551/DE561 Web Portal:
Download the update file (de551_1.0.2_to_1.0.3_r3.tar.bz2) to your computer.
Navigate to the Update page the HD492 Web Portal and click the Choose File button.
Select the update file you just saved and then click the Upload button to load the file onto the unit.
After the update finishes uploading, click the Proceed button to begin the update process. This should take 1-3 minutes.
When the update is complete, the encoder will power off automatically; please do not power the unit off yourself.
The web site will indicate that the update is complete once the encoder has been powered back on. You may need to perform a "hard refresh" in your browser in order to see the latest version of the DE551/DE561 Web Portal.