If you own the Google Nexus S GSM phone and want to upgrade to the latest Android 4.0 Ice Cream Sandwich firmware then today your wish has been granted by GoogleNexus team, they tweeted earlier about the Android 4.0 update for Nexus S (Samsung i9020) which you can also download from below and can update manually using the step by step instructions.
Download Android 4.0 Firmware for Nexus S [official]
Official download link
How to update Nexus S to Android 4.0 firmware
- Download the above package and rename it to update.zip
- Now transfer it to the root of your phone
- Shut down your Nexus S and hold vol up + power button to Boot into recovery mode
- Browse to “apply update from sdcard” and select the update.zip