Watch a Core2's live boot + WiFi log in the browser - no dev tools. Desktop Chrome/Edge over USB.
CH9102 / USB-serial port.WiFi DISCONNECT reason=N and a scan of visible APs.reason=)
| 15 | 4-way handshake timeout - wrong password, or the AP requires PMF/WPA3 the node can't do |
| 201 | No AP found - the SSID isn't visible on 2.4 GHz in range (5 GHz-only / channel) |
| 202 / 203 / 205 | Auth / assoc rejected - MAC-address authorization, enterprise auth, or PMF required |
| 2 / 200 / 204 | Auth expire / beacon or handshake timeout - weak signal or PMF/roaming |
Flash the current firmware first at msviq.whsiq.com/flash - it adds full 2.4 GHz channel support and these diagnostics. Copy the log to me and I'll tell you the exact cause and fix.