Tutorial rooting & unlock bootloader for Nexus sAMOLED/I9020

required :
•Android 2.3 SDK -> http://developer.android.com/sdk/index.html
•PDAnet -> http://www.junefabrics.com/android/download.php
•Clockwork Recovery Image -> http://www.koushikdutta.com/2010/02/clockwork-recovery-image.html (select nexus s)
•Superuser -> http://forum.xda-developers.com/showthread.php?t=682828
•USB Driver

1. Install Android SDK on pc / laptop then run SDK manager, there'll