Never flash firmware over a Wi-Fi connection. If the wireless signal drops for even a microsecond during the transfer, the update will fail and ruin the router. Connect your computer directly to the router using a physical LAN cable.
Recent security reports have identified significant vulnerabilities in the DWR-M960, making updates mandatory for all users: d 39link dwrm960 firmware new
Go to Management or Advanced settings, then locate the Firmware Update or Upgrade section. Never flash firmware over a Wi-Fi connection