I set myself one like this 5-6 years ago, it works on firmware for 19 years (I don’t remember the version), I also put this one in the girl’s apartment. And a year ago in a 5-room apartment (there are 3 phones, mi box s (sometimes there is not enough power of 5 GHz, the TV is far away) On average, now in my apartment there is a TV, a computer (via lan-cable), 3 phones and robot vacuum cleaner, channels about 2 years ago tuned to more-free, power at 2.4 GHz - 50 percent, at 5 GHz - 50%.
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