Is there a reason why newer releases of the A5 firmware are not being released?
The last A5 version was released on 11/18/11 while there was two releases of A4 after that.
Thanks for posting! We actually have an A5.03.00 release that we hope to have ready for download this week. It will be available on our main website, http://www.adtran.com .
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Will this also be released for NetVanta 644?
Yes, the NetVanta 644 will have a release of A5.03.00 as well.