[Q] Nexus 7 3G(Nakasig) Lollipop OTA Issue topic

I just Received OTA update 5.0.2 for Nexus 7 3G Nakasig. After updating i couldnt find any settings related to Mobile Data. Its completely gone from the settings. I tried replacing SIMs. I cannot enable 3G anymore. I wanted to flash my android to Stock android but i cannot find Images for it anywhere. I think i got the OTA by mistake (maybe of WIFI nexus 7)

Any Ideas .