Factory reset protection(FRP) becomes frustrating when you dont know the account that was previously synchronized with the device.
To save you all this stress whenever you want to do a factory reset
Navigate to Settings > Accounts and delete / sign out of the Google account associated with the device
During setup (using the setup wizard), do not connect to a Wi-Fi network. Also, untick “Protect this device
Method 2: For this method, All you need is just a Miracle Box and MTK 65xx drivers
Download and install MTK 65xx drivers from here
Launch Miracle Box
Under MTK tab click Unlock/Fix
Click Clear Settings/Frp
Click Start button
When the backup flash pop up appears, SelectNO
Connect the device to PC
Miracle Box will detect the device and start the process
When you see Done!, the process is complete
Disconnect and reboot phone
First boot after this process takes a bit longer than normal, so be patient and wait for it to boot completely.