Root Cannot flash recovery after OEM unlock (protocol error)?

[lifted]

Model: Nexus S
Android: 4.04
Baseband version: I9020AUCKJ1
Build: IMM76M


Hi everyone,

I'm trying to root my Nexus S for the first time. In Windows XP, after I unlock the bootloader I've tried flashing CWM. On the phone it reads:

FASTBOOT STATUS - DATA003a7000

and it hangs in command prompt. I'll select recovery in the bootloader and it just brings me to the 'Android system recovery <3e>'

When trying to flash recovery in Ubuntu I get the message 'okay' on the Nexus S and 'FAILED status read failed (Protocol Error)' in terminal.

I've searched as many articles as I could on the topic of rooting. Any help would be appreciated!