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I cofigured the RUT955 with success, i did test speed and check network connection and work ok. It appear that a firmware RUT v6.00 was available, did the process and when I restart the RUT955 it just connect to 3G with less test.
The opposite has happened to me. Before it went only in 3G, after the firmware update it also goes in 4G
From Italy, SIM Vodafone