Summary
If you're unsure or uncomfortable with the update process, consider seeking help from D-Link support or a professional. firmware version dwr-m960-v1.1.49
beyond v1.1.49 due to the disclosure vulnerability. You can find official updates by searching for your specific hardware revision (found on the underside of the device) at the D-Link Support Center a newer version to secure your router? (Non-US) DWR-M960 : H/W Rev. Ax :: F/W v1.1.49 - D-Link Firmware Overview — DWR-M960 v1
Supports 4G LTE Cat4 with speeds up to 150 Mbps downlink and 50 Mbps uplink. Redundancy: Includes an auto-failover (Non-US) DWR-M960 : H/W Rev
Use a Wired Connection: Never update router firmware over Wi-Fi. If the wireless signal drops for a split second during the transfer, the update will fail. Use an Ethernet cable to connect your computer directly to the router.