I have changed my SIM from my another Android phone (which was Lava X1) to Auxus Note 5.5. As soon as I changed and rebooted phone, it got locked.

I understood that it was due to Mobile antitheft apps was been install in the Lava X1.

Now I restored Firmware with help of service support but its IMEI number has been lost and I am not able to restore it.  Is there any solution?