Tp link ac1200 dual band
WARNING: Do NOT flash the tplink_C50-v4-squashfs-sysupgrade.bin from the “Downloads” section to the C50 v4 via the TPlink firmware's web GUI. It is even faster than the latest stock firmware. But you can use instead the 18.06.8 release. This is not tolerable and the problem not solved. I cross checked this with different firmwares and clients. The performance in the 2.4 GHZ range is degraded/buggy. One big problem is the 19.07.2 OpenWrt release. If everything is set up correct the router will load the image and restarts with a working OpenWrt firmware. To trigger the TFTP flashing just restart (on/off) the router and shortly after it turns on press the small reset button for a while. Just use this image: (check the hash!) rename it to tp_recovery.bin and put it in your tftpboot directory. This is also the prefered way to flash the first OpenWrt firmware. In this case you must use the TFTP recover method as described below. Unfortunately the smaller sysupgrade firmware is accepted by the stock router firmware but will brick the device. But you can flash between different official firmwares. Flash via WebGUI will not work because the OpenWrt firmware is not accepted by the router.
Installation is not so trival as the before short mentioned procedures suggest. WARNING: Do NOT flash the openwrt-19.07.2-ramips-mt76x8-tplink_c50-v3-squashfs-sysupgrade.bin from the “Downloads” section to the C50 v3 via the TPlink firmware's web GUI.