You should consider a hard reset in the following scenarios:
After a hard reset, your LAVA Iris 51 will likely prompt you to enter the previously used on the device. This is a security feature known as Factory Reset Protection (FRP). If you know your account details, simply log in. How to Hard Reset LAVA Iris 51
If you can still unlock your phone and open settings, this is the easier method. You should consider a hard reset in the
A hard reset restores your LAVA Iris 51 to its original factory settings. This means: How to Hard Reset LAVA Iris 51
A: No. FRP is a security feature. After a hard reset, you must log in with the previous Google account. This prevents thieves from using the phone if stolen.