@Troy360 apologies, I think I sent you down a dead-end, I have checked my home HP printer and it only supports 802.11n, yet is working perfectly with an MR55/56 setup running 28.5. The SSID it is connected to is in bridged mode with other settings as below: The APs are set to a minimum bitrate of 12Mbps on both bands and they are on dual band without band steering.
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