I have GL-inet Beryl. It seems that MicroSD card is not recognized.
I recognize the microSD card, but there is a problem with extroot. Extroot for USB flash drive works without any problem.
The USB flash drive works for me too. Also, the MicroSD port is loose, even when it is “clicked” in, and maybe this is the reason MicroSD is not recognized.
My problem. I inserted microSD in a wrong way. Correctly inserted, microSD card works!