March 30, 2012
An official 4.0.4 update is now available for Nexus S I9020T and I90203. For now, the only manual update is available. This works for both the I9020T and I9023. We’re still waiting on the I9020A. Here is that update file if you want to do it manually. This version is a kind of bug fix patch to solve most of the known bugs in 4.0.3 version including battery issue.
I have got my OTA and updated my phone without any issue on 10th April 2012. Google has announced to push official OTA for nexus s phone, hence you could get your update soon.
Few ICS Features List :
Quick Task Management (holding the Home button)
New Lock Screen (no Face Unlock)
New Browser (Finally a decent stock browser IMHO)
New Launcher (just like the Galaxy Nexus’ minus on-screen buttons)
New Keyboard and Voice Recognition
New Camera App with Panorama mode
New Notification Bar
Screenshots (Hold Volume Down + Power)
Below the Easy Steps to Upgrade your Nexus S Phone to ICS 4.0.4. This steps are for the phone model I9020 and I9023 from the Android version 4.0.3 to 4.0.4. If you are running with older version, please upgrade your phone to 4.0.3.
If you follow this guide carefully, you should not run into any problems. However, there is always a very small chance that you may brick / destroy your phone. We are not responsible for any damage that may be caused throughout this guide.
Step 1 : Before You Start
I prefer to take a backup before I perform any update, hence I recommend you to take a backup.
Download the Android 4.0.3 Ice Cream Sandwich update & rename it to update404.zip
Make sure that your phone is fully charged throughout this upgrade.
Step 2 : Connect your Nexus S to your computer via USB and copy update404.zip to the root of your SD card (Do not drop it into a folder or this won’t work!).
Step 3 : Power down your Nexus S Phone.
Step 4 : Power your device on, while holding the Volume Up button, followed by Power button.
Step 5 : Use the volume buttons to navigate to RECOVERY mode and press the power button.
Step 6 : When you see the exclamation mark on the screen, DON’T PANIC! Hold the Power button followed by Volume up button.
Step 7 : Select the option to Update from SD card select the update404.zip package you downloaded earlier and press the power button to confirm.
Step 8 : The update will now install automatically. When it’s down your Nexus S will boot up into Android 4.0.4 …
Enjoy your Nexus S With Fully working Ice Cream Sandwich.