Installing GreenPois0n for iOS 4.2.1

Initially I had a lot of issues getting this jailbreak to work, but after I found some more info, it now works.

At first I was getting the issue:
Unable to find gBdevList
Unable to find fs_mount
Unable to find fs_unmount
Unable to find fs_load_file

but after following these directions, it works:

  1. Make sure you’re using Greenpois0n RC5_2 (RC5.2 works too)
  2. Make sure device is connected to your Mac
  3. Open Terminal
  4. Type “cd Desktop” without quotes and hit enter
  5. Type “open” without quotes and hit enter. A second Terminal window will open and Greenpois0n will start
  6. Follow the instructions in Greenpois0n to enter DFU mode and it will jailbreak

if you need a place to download greenpois0n you can go here:

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