Backup all your important data 
  • Backup your SMS messages.
  • Backup Contacts, Gmail and Google Data.
  • Backup Call History.
  • Backup WhatsApp Messages.
  • Backup APN Settings: GPRS, 3G, MMS Settings.
How We Can Install Rom? Here Steps ! Be Sure Your Better is 80-85% And USB debugging mode is On.
Step 1 – Connect and mount your Galaxy Mini USB memory on your computer using the USB cable.
Step 2 – Now copy/paste the Android 4.0.4 ROM zip file to your SD card. Make sure the file is in the SD card root.
Step 3 – Then turn off your phone.
Step 4 – Now to get in the recovery mode. Switch on the phone while pressing and holding the Menu + Power buttons.
Step 5 – Follow the navigation instructions on the screen. Select BOOTLOADER and then go to RECOVERY.
Step 6 – In ClockworkMod recovery, wipe data first. Then scroll down to “flash zip from SD card” and press the power button to select it.
Step 7 – Press the power button again and select “choose zip from sdcard”.
Step 8 –Now using your volume keys, navigate to Android 4.0.4 ROM zip file and select it using the power button. Confirm the installation on the next screen and the installation procedure should start now.
Step 9 – After the installation completes, go to “+++++Go Back” and reboot the phone by selecting “reboot system now” from the recovery menu. The phone will boot now and it might take about 5 minutes to boot on your first time. So, please wait.
Can't Wait For it? --> Download : Here