You can do this by going to “Settings > Applications > Development > USB Debugging”. Phone data you may want to back up include notes, SMS messages, contacts, call log, files, and Internet and MMS Settings. Get your phone data backed up, since there is a very high probability that your data will be erased in the process of updating your phone’s firmware.It contains the tools and files to be used to upgrade your phone. Download the XWJVZ 2.3.6 Gingerbread firmware update files to your computer.Preparationsīefore we go to the actual installation process, take note of the pre-upgrade requirements: However, do not apply this update to devices which are network-locked. This update is also a global update, which means that anyone with a Samsung Galaxy S GT-I9000 can install this update.