As far as I know, it would be the 2300E and not the 2300A.
If you are looking for a new firmware, you can upload a modified metabox II firmware to it. I highly recommend the upgrade, it kept crashing with the 2.96 software and now it is very stable running the metabox one.
I have posted the complete procedure here __http://satellites.co.uk/php-bin/forum/showthread.php?t=54755 last week.
Enjoy