Once again, choose a line using volume up/down and validating with power.Once you see the exclamation mark screen, keep the power button pressed while pressing once on the volume up button to make the system recovery menu appear.Change the highlighted line with the volume up/down keys, press the power button once on the RECOVERY line.Turn on your phone while holding the volume up key, you will enter the bootloader menu.Place the files onto your Nexus S mounted through USB (anywhere with any name, just remember where they are).Download the original Google Android 2.3.3 archive and the Google Android 2.3.4 update archive.Also, leave the 2.3.4 update file on the phone as it can be applied right after restoring 2.3.3. If you need to restore, keep in mind that all of the user data and preferences will be lost, so don’t forget to backup first. This section can be skipped if you are running 2.3.3 non-rooted, or rooted in a way which doesn’t trigger and error with “status 7” when trying to update to 2.3.4. It doesn’t hurt to back up the USB/SD memory just in case. The upside is that the internal USB/SD memory doesn’t, unlike when unlocking the phone with fastboot, so you can quickly restore apps and data by using an application like Titanium Backup. The downside is that all of the user and application data gets deleted. Step one was to restore the original unrooted Android 2.3.3 release, as the update to 2.3.4 works from there. Updated 2011/10 : The 2.3.6 update works fine too (see below). The main issue I had was that my phone was rooted, making the official update package fail with a “status 7” error, because the existing system was modified. These are my quick notes after updating my Google Nexus S Android phone to the latest 2.3.4 release from this week.

Android 2.3 6 Update Zip