This (how to) video shows the steps of upgrading the firmware of Samsung SGH I997 Infuse 4G from Froyo 2.2.1 to Gingerbread 2.3.5 Please refer:- forum.xda-developers.com www.samfirmware.com/apps/blog/show/8830330-android-2-3-5-for-infuse-and-galaxy-s-4g- www.punnyabrataonline.info A factory reset needs to be done to ensure phone is working smoothly immediately after the upgrade. All credit goes to xda forums who have helped me create this tute. Warning:- Attempt at your own risk. May brick your phone. Some apps may not work post upgrade. All user data might get deleted.