And it is important that do this process with your own risk. Ok, here we go
  1. You need to download ROM which was most wanted with .zip ( for example MIUI, MODACO, and more)
  2. Put on to SD external (or for CWM, it takes CWM external)
  3. Reboot into recovery via ROM Manager or shut down the phone and press the power + Vol down button or you can takes 2X application reboot
  4. After Recovery mode, backup your ROM before by choosing backup and Restore >> backup
  5. After backup, go back to page one
  6. Choose Wipe data / Factory Reset
  7. Choose Wipe Cache Partition
  8. Choose Advance >> wipe Dalvik Cache
  9. Go back to page one and choose the “install zip from SD card”
  10. Choose zip from SD card >> file zip ROM that has been copied
  11. Installing zip
  12. If all process have done, please reboot system now