I've had many VOIP problems after upgrading firmware to 3.10, so I downgraded back to 3.01.
However, once I did that, I can no-longer change the firmware to anything else!!!
I'm trying to change to DD-WRT or to D-Link 3.12 but any firmware I try to load I get a message that "The uploaded firmware file may not be correct. You may have uploaded a file that is not intended for this device, or the uploaded file may be corrupted."

Any suggestions?