Here are the basic steps to downgrade your Baseband from 2.x to 1.59.00 for your iPhone 4 :

  • Close TinyUmbrella (if open)
  • Close iTunes (if open)
  • Remove ALL lines in your hosts file that contain
  • Windows: Start -> cmd -> ipconfig /flushdns
  • Mac: Terminal -> dscacheutil -flushcache
  • Start iTunes
  • Restore (NOT UPDATE) iOS 4.0.2 iPhone 4 - 4.0.2 Download
Note that this will only work while Apple is signing 4.0.2 SHSH requests. This is due to the way Apple now updates/restores Baseband Firmware for the iPhone 4 different from the way it did to prior devices.

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