I recently purchased a RV120W router and I am having a problem selecting n speed under the wireless settings.
If I select B/G/N-Mixed mode then when I go to save the change I get B/G/N-Mixed B/G/N-Mixed in red letters and it does not save. If I select N only then when I go to save it says in red letters N only N only.
It does not matter if I pick 20 only or 20/40. It does not matter if I enable or disable U-APSD. It does not matter if I use the LSB or USB side.
When I got the router it had an older firmware if I remember correctly, and it would let me change to n speed.