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I bought a used Nexus S that is on version 2.3.6.

It does not seem to be reading any SIM cards and the baseband version is listed as unknown. I think it may be on a custom ROM because of this. I want to flash it back to a stock ROM but have no idea where to start. My Nexus S is I9020A so I downloaded 4.1.1 from here but have no idea where to go from here.

Are there any easy to follow guides? And am I even on the right track here?

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I don't think there is such a model as "galaxy nexus S". There's a "galaxy Nexus", and a "Nexus S". I assume you have the latter, since the URL for its official image is almost the same as what you mentioned: dl.google.com/dl/android/aosp/soju-jro03e-factory-c9f5a67d.tgz –  offby1 Sep 22 '12 at 22:12
    
It looks like [this][1] might explain how to do it. [1]: android.stackexchange.com/questions/26612/… –  offby1 Sep 22 '12 at 22:27
    
It sounds like your phone is missing the modem. I accidentally did the same thing once while updating a phone. You can just find the best modem for your area and flash it to fix this. –  SaintWacko Sep 24 '12 at 16:51
    
Did you notice that the link you provided points to a Nexus S 4G model, which is not the same as I9020a? The correct firmware would be sojuajro03e –  onik Sep 25 '12 at 10:38
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