Need help! Samsung S20 causing my router to crash (updated)

Last edited Sat Oct 2, 2021, 02:54 PM - Edit history (1)

My google-fu is failing on this one.

My kid just got a new phone, an unlocked, refurbished S20, in the mail today.

He's having an issue with connecting to the WiFi. He knows the password and SSID, but when he connects to the WiFi, the entire router crashes within 5 seconds.

The router normally has four white LEDs on it. When he turns his phone's WiFi on and connects, the power LED turns red and all the other LEDs go dark. Anything connected to it, whether hardwired or on WiFi, loses internet. It seems to restart, reconnect to his phone again, then does a crash and reset. Rinse and repeat.

Once he turns his phone's WiFi off the router comes back and behaves normally... four white LEDs.

The router is a D-Link DIR-1950.

I even logged into the router and told him to turn his WiFi on while I monitored the devices connected to the router; I was never able to see his phone before the router crashed.

All the help on the internet seems to be with fixing WiFi issues with the phone; no mention of causing the router to crash.

Anybody have any clue? Can I change a setting on my router?

The phone wants to do a software update but... get this... it will only do it over WiFi. I have unlimited data through T-Mobile but the phone won't download the update except over WiFi.

Pretty sure this is the definition of a Catch-22: Your problem of not getting on the WiFi can only be fixed if you've gotten onto the WiFi.

Update: my kid was able to hook up to his school's WiFi and update his phone without any issues. Still crashing my router though.!