Turn off the Vodafone pop techno by pressing the Power button for at least 2 seconds. After 2 seconde presspand hold the Volume Up also and Power keys for a couple of seconds. When the logo appears let release the Power button and continue to hold down the Volume Up until you see Android robot. Then press Volume Down + Power key and tap the Volume Up once to bypass the no command mode to Recovery Mode
In recovery mode choosed "wipe data/factory reset" by using Volume buttons to navigate and the Power key to confirm that. After that select "yes" from the menu and press the Power button. Choose "reboot system now"