For HA3969U models with non T controllers, latest version 3.8.51 is downloadable here.
For HA3969U models with T controllers, latest version 1.9.51 is downloadable here.
Unzip the file and use embedded SANWatch Management Software accessible from your web browser to update firmware. Go to Maintenance > System > Software Update.
Enter the following default login account:
User name: admin
Password: admin
Additional documents included on the DVD are Quick Start Guide, Hardware Manual and Software Manual.