D-Link DIR-2640 A1

The D-Link DIR-2640 is a Wi-Fi 5 Wave 2 router based on MediaTek MT7621A with 128 MB flash and 256 MB RAM. It has 5 Gigabit Ethernet ports, one USB 2.0 port, one USB 3.0 port and dual MediaTek MT7615N radios, capable of up to 4×4 streams on each band.

→ Install OpenWrt (generic explanation)

OpenWrt can't be installed through the stock firmware on this router, as it only accepts properly signed and encrypted files in D-Link SHRS format. Use the D-Link Recovery GUI instead to upload the OpenWrt factory image for this router.

• MT7615N 5 GHz Problems - see https://forum.openwrt.org/t/openwrt-on-mt7621-mt7615n-devices-with-5ghz-problems/107392
  • UPDATE: Resolved with OpenWrt 23.05 release and later versions.
• D-Link DIR-2640 A1 was mentioned in one of OneMarcFifty's YouTube video:
  • Which Router is best for OpenWrt in 2021?
  • Near ending of the video, DIR-2640 A1 was described as compatible (MT7615) to DIR-2660 A1
  • Newcomers to OpenWrt are recommended to check out the video.