Hello. I have a RB751U.
My Android smartphone got only 54mbps from my home WiFi.
And other phones of my guests too.
In other free wifi zones i see 72mbps in my phone.
How to fix my home wifi?
Thanks.
///
images size fixed
it is not possible to see the full images of your screenshots. Or at least i cannot.
Your AP is manually set to B/G mode, why did you do that? It will limit the datarate to 54Mbit.
Do a wireless reset, and keep it to defaults. Do not change this setting. In command line you can do “/interface wireless reset” to set wireless config to defaults.
Done.
But now i have only 11 mbps
Done
Now i got only 11 mbps!
if you set 802.11b what more you expect? Please see wiki.mikrotik.com wireless section on how interface should be configured. Or at least set band=2GHz-b/g/n
you must select 802.11n !!
Done!
But no chance. I still have only 65mbps only on my home router 
WTF man. Just set 20/40Mhz B/G/N and rtfm
Anyway I don’t think you will see more than 65mbps on any mobile device.
True.. Most mobile devices only have 1 antenna chain. When using 20MHz channels (default) thats 65mbit.
The chipset of this device can only go up to 65MBit/s
try RB2011UAS-2HnD-IN and you will reach 72MBit/s
or a RB912UAG-2HPnD