Mito Fantasy imei invalid after format done

Mito Fantasy imei invalid after format with flashtool how to repair  ?

1. Make sure USB Debugging ON and Download Drivers for all windows supported 
2. Root Mito Fantasy untill reall success
3. Download and Install MTK Droid Tool
4. Open Mtk Droid Click Root and the following step by step until success
5. Click Change Imei from Mtk Droid Softwares
6. Input your phone imei back cover battery
7. Click Reboot
8. Wait untill Phone reboot and will Show your Phone imei if your Lucky