SurfBeam 2 Pro modem

now i have viasat Model RM4100N-010 Modem
i am in blue beam ( turkey )
i bay active code from germaney i tell him for Blue beam
but it is notwork Appear message :
Sorry the Activation Key you inserted is invalid for your country. Please contact your reseller.
I have Two questions :
1. If I was in the blue Beam
And I have SurfBeam 2 Pro modem
I can buy any active Key Beam (orange, green , violet , …… ) from anywhere
And I activated it on SurfBeam 2 Pro modem in the blue beam
The code will work without any problems and without  Appear message
Sorry the Activation Key you inserted is invalid for your country. Please contact your reseller.

Correct ???

2. I want  big bandwith in 1 month  ( more than 500GB )
Where I can get it ???
What is the largest band with of data can be obtained in monthly ??