History: INVALID IMEI 1st. i flash the phone again using free soft
here Screen shot
2nd. After Flash HARD RESET 
This is the real problem of this phone
3rd. Proceed IMEI Repair
Here another Driver i use
Android MTK Driver - Download - 4shared Android Mtk CDC Driver - Download - 4shared
a.
TURN OFF THE PHONE
b.
HOLD PRESS Volume UP then connect USB Cable
c.
Open Device Manager Install two Driver Open Volcano Software 
Write IMEI 
a.
Phone must be Off and USB Cable are disconnected
b.
Click WRITE IMEI then connect the USB cable( wait for a few seconds to write IMEI smooth w/o error) 
REMOVE BATTERY TO TURN OFF then TURN ON
Finally DONE 