How to Unroot Nexus S! [i9020T][i9020A][i9023]

Here's how to unroot Nexus S!
See full step-by-step instructions here:
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Stock ROM for i9020T (T-Mobile) and i9023:
Stock ROM for i9020A:
Fastboot.zip:
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Nexus S Reference
For all ROMs, you need to root your Nexus S FIRST!
How to Root Nexus S or Nexus S 4G:
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How to Backup/Restore/Install ROM on Nexus S:
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How to Install new ROMs:
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How to Unroot Nexus S:
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How to Unroot Nexus S 4G:
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Nexus S ROM Reviews
CyanogenMod 7.1 ROM for Nexus S:
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SuperOSR ROM for Nexus S:
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SuperAOSP ROm for Nexus S:
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Infin1ty ROM for Nexus S:
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ZuluZulu ROM for Nexus S:
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Oxygen ROM for Nexus S and Nexus S 4G:
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MIUI ROM for Nexus S:
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Open Soju ROM for Nexus S:
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