Solved: Resetting myPhone 6680 hard reset: Go to Menu > Phone Setup > Restore Factory settings > Enter....

myPhone 6680 Share dual SIM hard reset

Go to Menu > Settings > Phone setup > Restore Factory settings > Enter 1122 > Yes.

Note: You must insert at least one SIM card to see this option.

myPhone 6680 Share hard reset

OR

USE firmware / ROM update tool MTK ROM update tool

myPhone MTK firmware ROM update tool