Login to the Adtran Internet site at www.adtran.com
Select SUPPORT at the top.
Scroll down to DOCUMENTS AND DOWNLOADS > SOFTWARE RELEASES
By Product Line = NETVANTA
By Family = NETVANTA 6000 SERIES
Select Product = NETVANTA 6310
FIND SOFTWARE button
Scroll down, select NETVANTA 6310/6330
Select YES
Select your country such as UNITED STATES
SUBMIT button
Current Extended Maintenance Release
Or Current Feature Release
Or select ARCHIVED RELEASES
Download the RELEASE NOTES
Select the DOWNLOAD link.