Please make sure that you have taken the backup as the phone will be restored to factory condition and no data will be left in it.
Step 1 Download and install PC companion for Sony Ericsson's website.
So grab your copy of the PC companion suite from Sony Ericsson's website and follow the simple steps once you get the update notification.
Before you plan to upgrade your Xperia X10, make sure you have fully charged your device and taken the backup of your device in terms of contacts, pictures and any file that is on the device.
The Arc S was one of the last smartphones to come out of Sony's relationship with Ericsson, and quite a phone it is too.
The device is powerful, easy on the eye and performs brilliantly thanks to its Android Gingerbread operating system - but imagine how much slicker, faster and more powerful it would be with Android 4.0, or Ice Cream Sandwich, on board?