I’ve updated router’s firmware from 00.07.04.15 to 00.07.06.1
Switch “Keep settings” was switched on.
After update wifi-conected devices lost conection with router.
Futhermore, router’s SSID is now absent in wireless networks scan list.
I’ve deleted SSID and create it again. WiFi interface status in router’s WebUI is Up, but SSID still absent.
Have you any advice, please?
Update.
I’ve downgraded firmware version to 00.07.05.4, setup wireless network again, but SSID was invisible still. Overmore, cable-conected device lost access to the Internet. 
But router began to work normally due the power cycle!
Strange, but true: it was rebooted several times before through WebUI without any effect, but after cold start works normally/
Thanks to all for your attention.
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