I asked tp-link and they said they will release a firmware to solve the problem later. Maybe we can try the new firmware when it released.

You can check the compatibility list here. Choose your region and find the compatible modems. http://www.tp-link.com/en/support/3g-comp-list/?model=TL-MR3020

MR3420v1 is an old product and discontinued long ago. So I think tp-link will not update firmware for it.

Hi,you are using and old firmware. Maybe the folder number is limited. You can upgrade the latest firmware and check if it solved your problem....

Hi,the best way is to choose PVC 2 and set static IP. It's much easier and more stable to connect.

The IP address pool will auto change to Start IP address: 192.168.1.254 end IP address: 192.168.1.254? It's abnormal behavior. You can try to reset this device and check if it could solve the...