Would be Better to upload 2 screenshot.
1. Shot of "invalid page"
2. Shot of IMEI page from "About phone/Device/Mobile/
Anyway, maybe there is 3 problems with your device.
1. IMEI Problem (Need to flash your Stock ROM)
2. career/Operator. (Try to insert different operators SIM.)
3. If you have ever been tried to get root access. (Pls unroot or make flash with fresh copy of your devices ROM.)
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