@Blue1234 

Good day.

Thank you for your time and patience.

Due to the CE certification, RE200(UK ) V4 only supports 5Ghz channels:

band1 (36 40 44 48)

band2 (52 56 60 64)

band3 (100 104 108 112 116  120 124 128 132 136 140)

(band 2/3 are DFS channels.)

while for the US version of C6 V2, the supported 5Ghz channels are:

band1 (36 40 44 48)

Band4:149-165

So, since RE200 does not support band 4 like channel 149-165, so it could only see C6 when the router is on channel 1;

For the Samsung S9, is there any way you could check if the smartphone could be modified to support band 1 as well?

Really sorry for the inconvenience.

Thank you very much for your understanding and support.