@Sunshine Yes I mean I can not update the firware. My firmware is : 1.0.0 0.9.1 v7004.0 Build 190814 Rel.40071n . I am trying to update at least to the first update from the list :Update firmware...

I bought this router (MR200 v4) with a sim card from a provider. I can not update the router .i have always error 4503. The router is not locked by the provider , I already checked with another sim...