10.68.xx.xx is a private IP. What's the IP address displayed under 3G/4G on Status page of MR3420? If it is a private IP, to fix this issue, you have to contact the ISP and it can only be fixed on...

Raj, you want the firewall connected to MR3220's LAN port to obtain WAN IP from MR3220? Cannot do that.

Can you provide the screenshot of Status page? The number after Build shows current firmware version. So it is still 120524 after firmware upgrade?

I have never heard that tplink doesn't work with N ralink dongles... And as I know, some TP-LINK adapters are also use ralink chip. You may try to update drivers of your ralink dongle.

You have tested all ports using the same computer and same cable? Before firmware upgrade, it is one of problems with W8980? Or it is a new problem after firmware upgrade? Did you try to reset the...

It means that you phone cannot switch between two networks? If you disable 3G/LTE, can you connect Wi-Fi automatically or manually? How did you make it work again?