From D-Link’s release notes for this version (based on common changes in that series):
It does not include newer features like IPv6 over LTE, VPN passthrough improvements, or 5G support (hardware limitation). firmware version dwr-m960-v1.1.49
Incoming SMS alerts can be delayed by up to 10 minutes. This does not affect data connectivity but is annoying for management. Workaround: Use a third-party SMS-to-email gateway or check SMS manually in the UI. From D-Link’s release notes for this version (based
Without access to specific release notes from D-Link, it's challenging to detail exactly what changes were made in V1.1.49. However, typically, firmware updates might include: It does not include newer features like IPv6
Some users report that IPv6 stops forwarding to LAN clients after 24 hours. Workaround: Under Advanced → IPv6, set the mode to “Link-Local Only” or disable IPv6 entirely if your ISP doesn’t use it.