@cmal09 Hi, may I have a screenshot of Advanced->Status and Advanced->Network->Internet page on the MR6400 when using with Digi SIM card? For comparison, you could also send us screenshots of the...

@Zorro16 Hi, is the wired connection or 2.4G connection still working fine? Please login the web interface of the MR600, try to change the 5G WiFi name and Password, then try to connect the 5G WiFi...

@Haarry Hi， I noticed that you have already located the SIM card issue in another post: https://community.tp-link.com/en/home/forum/topic/559890?replyId=1104238

@Haarry Hi, thank you very much for the reply. Glad to hear that you have located the issue.

@Min_VNP Hi，what is the model number, hardware and firmware version of your MiFi device? Please provide more details about the issue as well.

@carlesp Hi, what is the model and hardware version of your MiFi device? And please also provide more details about the issue.