P-660HW-T1 V2

The latest firmware We are aware of is V3.40(AXL.1) | 11/21/2007 - If anyone has a newer firmware please let us know.
This Modem may have trouble syncing with BE's default INP2 interleaved profile however it does work on Fastpath (and possibly SP20?) - Dragon2611
This Modem may not sync on an Annex M enabled line unless the config tweaks below are applied
Whilst this router has a "bridge" feature it seems to cause it to get stuck in a reboot loop where it will reboot shortly after syncing. - Dragon2611

ADSL2+/AnnexM config

With thanks to AAISP who kindly allowed us to copy this information from their KB

Sometimes the router reports ADSL2 DELT mode, and has low sync rates (~7 meg) on a line that can support more.
The ADSL2 DELT is a red herring.
This is a 7.1 meg max sync.
Telnet in, then type:
"sys edit autoexec.net"
Press "i"
You should see a colon
When you see the colon, type the following command:
"w dmt2 set largeD=2"
Press enter, then press "x".
You can verify that autoexec.net contains the new command by typing "sys view autoexec.net".
After a reboot, the sync rate should be increased.
This only applies to the T1v2.

The router does not do Annex M by default; it needs forcing.
Telnet in, then type:
"sys edit autoexec.net"
Press "i"
You should see a colon
When you see the colon, type the following command:
"wan ghs set annex m"
Press enter, then press "x".
You can verify that autoexec.net contains the new command by typing "sys view autoexec.net".