Mudi 7 (E5800) won't connect when set to 5G-only and does not lock to a tower

Router
1

I am experiencing what appears to be an issue with the Mudi 7 (E5800).

My SIM card connects and works correctly when the network mode is set to Auto. In this configuration, the device successfully connects using 5G NSA. However, if I force the network mode to 5G Only, the device fails to register on the network and no connection is established.

The same behavior occurs when I attempt to lock the device to a specific cell tower. Once the tower lock is applied, the device fails to register on the network, even when the network mode is set to Auto. The device only works properly when the network mode is left on Auto and no cell tower lock is applied. If either 5G Only mode is selected or a cell tower lock is enabled, network registration fails.

Is anyone else experiencing the same issue? I observed this behavior on firmware version 4.8.4, and it is still present in version 4.8.5 released today.

3

The 5G only network mode forces the router to use 5G SA. However, there may only be 5G NSA available nearby. Therefore it's unable to connect after setting to 5G only mode.

As for registration failure after locking onto a specific cell tower, the cell tower may have restrictions that prevent the router from connecting.

Generally it's recommended to use auto mode, router will automatically select the optimal network.

4

I live in a US big city, even I cannot be sure 5G only works as I roam around on train, not sure why you would expect the same.

5

@beepboopbeep I think the key part of your message is that you're moving around on a train. In that situation it's perfectly normal to experience coverage changes and handover issues between cells. My test was done in a fixed location, where the router naturally connects to 5G NSA without any problems. Because of that, @Cathy 's explanation about "5G Only" forcing 5G SA while only NSA may be available actually makes sense to me.

What still doesn't make sense is the cell lock issue. I've tested several different towers and get the same registration failure, so it doesn't seem to be limited to a single cell with specific restrictions.

6

NSA 5G is made up of many bands. LTE and 5G. When locking to a specific tower, let’s say the one with strongest 5G signal, it may fail because that tower doesn’t also include the necessary LTE bands. Obviously this is high level thinking but hopefully you get the idea.

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