It's not just broken, it actually cripples the router by disabling NAT acceleration. I tried using QoS to get SIP working acceptably, it went from barely usable to completely unusable, however much...

@Diak66 As far as I can tell there is NO fully working V1 firmware available and they've stopped even pretending one is coming. Time for EU based owners to hit them with the EU consumer law and get...

@Kostek "This product DOES NOT WORK as LTE MODEM" In the last 3-4 weeks running it as just a WiFi router, I've not seen it slow down, crash or need rebooting. This POS hasn't just got a terrible LTE...

So no reply from TPLink, no surprise about that, this POS router was DOA. Perhaps we need to discuss refunds for a router that has NEVER worked properly and now NEVER WILL?

@peterholm The only thing that worked for me was letting 'Quick Setup' find the WAN connection. I got the impression the error checks on doing it manually must be wrong.

@ironmanc for the MR600 V1, the 'reliability of the router' is pretty much dependent on using the daily automatic restart option! The router rarely crashes/spontaneously restarts, it just slows down...