I wonder that, with original firmware, my Xiaomi MIR3G router (and all other original MI firmware routers) shows "MI" logo on wifi network if you scan it with Xiaomi phone... Menu also indicate if it's "5G" signal or "2.4G/5G" mixed signal...
But after installing OpenWRT firmware on it, MI logo disappears near WiFi name anymore.
Does original MI firmware alter the beacon frame somehow?
How phone recognize that if that is Xiaomi/Redmi WiFi node or not without connecting them?
No, I don't think if this is emoji in the SSID name.
If it is, other phones need to show it also.
This only appears at Xiaomi phones.
Also scan from my linux computer doesn't show it any emoji in SSID either...