Sony Ericsson Xperia Mini can be updated to Android 4.0 Ice Cream Sandwich either thru Sony PC Companion (PCC) (download PCC here) or thru Sony Update Service (SUS) (download SUS here). I chose to update using SUS and below are the step-by-step screenshots while updating my Xperia Mini:
Just follow the instructions, they are self-explanatory. ^_^
Warning: Update your phone at your own risk.
Just follow the 4 reminders above, accept the license agreement, then click "Start"
Upon turning on, you will notice that only "SONY" will appear on the start-up screen, no longer "SONY ERICSSON". Then followed by "XPERIA".
It took about 2 hours to finish the downloading and installation of Android 4.0 ICS on my Xperia Mini (this may vary, it depends on the speed of your internet connection). At first, I was quite skeptical to do this update and considered to wait first and update some time later. But just two days after this update was made available (see my post regarding it here), I just found myself upgrading my phone. When my curiosity strikes, it really can't wait. Lol! So I just updated my Xperia Mini at my own risk.
So far, Android 4.0 Ice Cream Sandwich is running smoothly on my phone. Thank God! No major problems encountered yet. The issues that been fixed before this update (the overheating problem and capacitive button malfunction) did not returned after the update. My full observations and reviews on its new features will be posted soon.