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Root Bought a used droid with android 2.2 and wi-fi doesn't work

No idea. How do I find out?

Under settings -> About Phone -> Build Number and/or Mod Version, what does it say? Some ROMs aren't listed there, but most are. Alternatively, you can download the paid version of ROM Manager (unless it's not already there), and find out what it lists as Current ROM. Good luck, some ROMs have this bug, but it should be easy to fix.
 
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