A lot of people have been telling me that they can’t get into ClockworkMod recovery to save their life, even if they’ve flashed the recovery in fastboot a thousand times. Well, that happened to me after trying to get into CWM after installing the latest ICS ROM.
This is some kind of security added after Android 2.3.6 ROMs that messes up your ability to get into CWM.
If this happens to you, you can still boot into CWM by flashing recovery to boot partition. This will basically boot your phone into CWM every time until you flash a new ROM.
Simply put your Nexus S into fastboot mode first then connect to your computer.
Then flash recovery image into boot by typing:
fastboot boot recovery3101.img
For Nexus S, you will need this Nexus S recovery:
Download Nexus S recovery
For Nexus S 4G, you will need this Nexus S 4G recovery:
Download Nexus S 4G recovery
These are old recovery images but they will work for you. Just install a new ROM and flash the latest recovery from ROM Manager. Most ROMs have the security feature removed so after installing a ROM this problem should no longer happen. But if it does, you know how to get your CWM back.
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You will need a rooted Nexus S to install all ROM/kernels.
NOTE: PLEASE ONLY INSTALL ROMS INTENDED FOR YOUR VERSION OF Nexus S! Otherwise you WILL BRICK YOUR PHONE and I will not be responsible!
How to Root Nexus S!
First time to rooting and custom ROMs? Please see our Nexus S FAQ FIRST! Nexus S ROMs
Nexus S ROMs
Nexus S 4G ROMs