I bought a new Victron Global Link 520. After switching on, the blue LED continues to flash (tested for two days) and status is: Connecting to LTE network. Reception is -73 dB. KPN indicates that coverage in my village is good. Last Transfer: Never LTE-M: Connecting to LTE network Sim status: Ready LTE-M signal strength: -73 dB Antenna: External Operator: NL KPN (20408) Could there be a problem with the included 1nce sim?