New How to hard reset Four mobile s150 1000% check By Gamzeozgesaroglu

First of all switch off mobile.
Then press V+ key.
Then Briefly Press power key.
now you are enter to recovery mode now 

When the System Recovery screen appears use the Volume Up/Down keys for navigation and the Power On key for OK.
Choose "wipe data / factory rest", "Yes -- delete all user data", "reboot system now.