Found this from search,
Here I made a table of supported WiFi channels for different regions of chinese version RT-AC86U with changeable region:
Possibly additional choosen DFS channels in Auto-mode are not shown in this table as they are not shown for manual selection.
Region/Channels 1-11 12-13 36-48 52-64 100-112 116 132-140 149-161 165
Asia............ x ...---... x ...---....---...---...---..... x ... x
China(Default).. x ... x ...---...---....---...---...---..... x ... x
Europe.......... x ... x ... x ... x .... x ... x ... x .....---...---
Korea........... x ... x ... x ...---....---...---...---..... x ...---
Russia.......... x ... x ... x ... x .... x ... x ... x .....---...---
Singapore....... x ...---... x ...---....---...---...---..... x ... x
United States... x ...---... x ...---....---...---...---..... x ... x
Australia....... x ... x ...---...---....---...---...---..... x ... x
116, 140 and 165 can only be used in 20MHz mode or auto 20/40/80
132-136 only in 20 or 40 MHz mode or auto 20/40/80
36-48, 52-64, 100-112 and 149-161 in all bandwith modes upto 80.
5G seems to have similar power everywhere (all regions and channels) except EU ch. 100-112 about 5dB better.
2,4G ist much lower for EU and china.
But something seems to be wrong with 2,4G, I randomly get -6dB or up to -20dB weaker signal for EU. Cannot figure out what happens.
And most interesting ch 1-5 about 10dB better than 9-13 if set to EU (makes them unusable for large area).
Feedback of other users with this chinese version much appreciated for comparison.
CFE 1.0.0.6 on mine.
Udated: Russia wifi-region starting with 384.9 or 384.45149 seems to be same stettings as for EU.