@Kevin_Z the problem occurs after changing channel to highs on main router: when i set number above 52, the RE205 lost view of router on 5 ghz, can't find channel, message on control panel - no signal.

The router supports range from ch36 to ch140, I tryed all these channels, ch52 is last viewed and successful to connects on RE205. From 36 to 52 connection happens good, but they are too much interferented.

The firmware on router is standard, last updated.

@Solarex - Just was configuing the RE205 today and experienced that with higher channels for 5G on base router, the extender does get network to extend. Have to force change from Auto to lower channel at 5G setting of the base router. I am using a TP LINK base router here.

Solarex wrote

@Kevin_Z the problem occurs after changing channel to highs on main router: when i set number above 52, the RE205 lost view of router on 5 ghz, can't find channel, message on control panel - no signal.

The router supports range from ch36 to ch140, I tryed all these channels, ch52 is last viewed and successful to connects on RE205. From 36 to 52 connection happens good, but they are too much interferented.

The firmware on router is standard, last updated.

@Solarex The same happens with my RE450. When I try to set channels 100 and above the RU extender detects the new channel but cannot connect to the router.