Is there any openwrt firmware for Linksys RE9000 AC3000? I could not find it and this did not appear to be broadcom and so I thought I should ask if anyone know anything about this device with Openwrt or any other opensource firmware.
That usually implies that the device in question isn't supported.
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yes, mt7621+mt7615+mt7615 should be supportable, but that doesn't imply anyone has actually gone out, bought one and done the necessary work to port OpenWrt to it - just that it probably could be done, not that it (ever) will be.