@Kam73 Thanks for your reply. Cause the main router works fine when the main Deco shows red, have you ever tried to swap the location of the Deco? And what is the operation mode of it? Try to change...

@igotek 1. The Deco and Tether app are different applications for different products. The Deco app is for Deco series products, while the Tether app is available for others....

@Mahin.Miah Below is the instruction to setup the remote management on the TL-WR841N. https://www.tp-link.com/support/faq/66/ May it help.

@Mahin.Miah The DNS is different from DDNS. You can setup DNS server under DHCP-DHCP settings page. For DDNS, it is used to make it more convenient to access the local network remotely. Below is the...

@Jleigh1 Have replied to you on another thread. We can get some details first, if it is faulty, we can arrange a replacement for you.

@Jleigh1 Hi All, For the "SIM card not found" or "No SIM card" issue, please refer to this link: [Troubleshooting] SIM Card not Found? Thank you very much.