bluboo picasso no service!

hello guys
i bought a bluboo picasso 3g a few days ago but i have a problem with my network! every time i am trying to connect a message pops up telling me that mobile networks not found! i tried to select the network manual but nothing! any advices?
already tried:
1.phone on/off
2.factory reset
3.change rom
4.change manually network
5.change selected network gsm/wcdma

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