How to lock the Nexus S Bootloader

If you would like to re-lock the bootloader, it is just as easy, if not easier than unlocking the bootloader.

Please follow the steps below to lock your Nexus S bootloader.

1. Power phone off.
2. Hold the volume up button and then the power button. You should load into the bootloader.
3. Type the following on your computer shell/dos screen: oem bootloader lock
4. You can now navigate to reboot your phone.

That is it!