Need to add IPv6 Support to ADSL router (Aztec 600E)

Hi,
I couldn't find a way to accomplish that support (I looked into all the
configuration options of that router).
My current problem:" I stuck in the middle of network installation of Debian
Sarge as APT can't connect to any source due to the lack of IPv6 support.

My network configuration:
Several PCs (various OSs), connected via a physical (non wireless) network
the a switch (Edimax 8 port 10/100). The switch is connected to an ADSL
"modem" (Aztec 600E which I got from the ISP, reconfigured to work as a
router+DHCP server/NAT). The router connects to my ISP using PPPoE.

I also searched the Internet and failed to find a source for firmware
updates for that router. Can anybody help here too?

Please advise !

TIA