W595 Configuration error... phone receive calls but not other func available

[mzoki1]

I flashed w595, using A2 uploader, but on screen I get message: "Configuration error. Please contact your network operator or service centre".
Tried several times flashing again and with different custpacks, but message still appears. Network works: emergency + receiving calls is o.k., but nothing more can be done - message is on display.
Without SIM card I can see initial Sony demo video.
Something strange to me is appearing 3G or E for network coverage without SIM card (display top left corner) and it is change/appears more/less like with SIM card
What have I done wrong?
My region is South east Europe - Serbia