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there was rom and root in my nexus s , then i deleted everything because i want load orginal rom but now i lost it.
Okay don't worry we are here to help you..
Just follow this thread to flash a new rom
http://forum.xda-developers.com/showthread.php?t=2034264
If you still can't understand the method in the above mentioned thread just use a toolkit..
Download the Nexus Toolkit by Wugfresh and follow the instruction to flash factory image of Nexus ..
You can root,flash factory images,unlock and relock bootloader with this tool..
If you haven't installed the adb and fastboot drivers there is a option for installing driver in that tool kit ..
Here is the link for the thread
http://forum.xda-developers.com/showthread.php?t=1984858
Need any help in using this toolkit just reply back via this thread :good: