Stock ROM and Sp flashtool from Hovatek download sections
Launch Sp flash tool ,load the scatter file of the downloaded ROM after extraction.
Select Download only or better still Firmware upgrade.
Click download
Remove the phone battery and slot it back then connect your phone PC .
Sp flash tool will start flashing.
Note ; No interruption please for successful flashing...
Mtk drivers must be install before you proceed.
Good luck as Succeeded when handling mine.