Help with D-Link DSL-2640B Please!

[TaKeN]

I'm hoping someone here will be able to help me,

I recently (a month or so ago) updated the Firmware on the above Router/Modem to EU_4.00 Hardware Version: B2

But its pants

The router runs slower than before and they've mucked around with the Port Forwarding to an extent that I can't get uTorrent to get any flow.

I'm after a source for the previous firmware versions if possible?

I've tried looking.. but can't seem to find anything

Thanks In Advance.

 

[Lethagized]

Did you fix this? I recently bought a 2640b to replace my o2 wireless box II, but it's pants. It keeps losing sync and locks up a lot.