When you have Myphone A919 duo and you forgot your password just follow these simple steps I outline below. Happy formatting your Android phone.
Step 1. Remove battery, simcard and memory card
Step 2. Insert battery
Step 3. Press Volume Up + Volume down then power up
Step 3. Select recovery mode by pressing volume up
Step 5. Select format/swipe by pressing volume down and pressing menu button
Step 6. Wait for the process to finish
Step 7. Select reboot phone
Step 8. Celebrate you have now a factory reset A919 duo phone.