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As figured out, MR3040 is no more available in Europe.
Due to this, I bought MR3020 and tested it with the same USB stick ZTE MF667.
MR3020 is not connecting to defined DynDNS service automatically after power failure or restart.
MR3040 had not that problem due to battery power.
Also, MR3020 although defined DHCP range of 192.168.0.1 to 192.168.0.199 changes itself and starts with 192.168.1.x.
MR3040 never done that.
Also, although defined port 8080 and 255.255.255.255 in remote management, MR3020 cannot be remotely connected.
How to explain and solve these problems with MR3020 (firmware 3.17.2 Build 150921 Rel.62529n, hardware MR3020 v1 00000000) ?