you can dowload stock rom from official smartek.me website from here : [Only registered and activated users can see links Click here to register]
extract the rar with 7z or WinRar
and then load the scatter and fladh with SP Flash Tool
If still unsure, look for "flashing with SP flash tool" on google, there are thousands of tutorials
by the way I have a smartek m5 smartphone and this fixed my bricked device