Samsung galaxy Mini GT - S 5570 Hardreset ( How To )

Try This :

1. Power off phone
2. Press and hold Menu Button ( middle ) + power on for at least 10 seconds
3. Android System Recovery Mode Appear
4. There are 4 options

reboot system now

apply sdcard:update.zip

wipe data/factory reset

wipe cache partition

5. Move the options to " Wipe data / factory reset " using volume down ( - ) button and menu button to confirm, because the touchscreen doesn't work in reovery mode
6. After the process done, phone will reboot.