I know some of you are having trouble with installing a new ROM on your Nexus S or Nexus S 4G, so let me go over it again.
Before we begin, copy over the ROM zip file you want install over to the internal storage of your Nexus S or Nexus S 4G.
Step 1. Install ROM Manager from the Market.
Step 2. Choose “Flash ClockworkMod Recovery” to update to the latest ClockworkMod Recovery. You only have to do this once or whenever there’s new versions.
Step 3. Choose “Google Nexus S” for regular Nexus S and R