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Fuzzyband is an application that can downgrade the baseband for iPhone 3G. Recently it has been updated to include the support for firmware 3.1.3 baseband 05.12.01. It works only with bootloader 05.08 (early iPhone 3G).

Why do users need to downgrade the baseband? The answer is simple: if they accidentally upgraded the new firmware and need to run unlock software (blacksn0w and ultrasn0w). Unlocked iPhones do not need Fuzzyband. iPhone 3GS users cannot downgrade baseband with Fuzzyband.

Fuzzyband is available for jailbreaked iPhones in Cydia (repository BigBoss, category “System” ).

fuzzyband 1 200x300 Fuzzyband, the application to downgrade the baseband, is updated with support of firmware 3.1.3 fuzzyband 2 200x300 Fuzzyband, the application to downgrade the baseband, is updated with support of firmware 3.1.3 fuzzyband 3 200x300 Fuzzyband, the application to downgrade the baseband, is updated with support of firmware 3.1.3

unlock Ultrasn0w: iPhone 3G Unlock for firmware 3.0 is ready

DevTeam released Ultrasn0w – application that will unlock your iPhone 3G with firmware 3.0. Here are the instructions:

  1. Ensure you have upgraded to iPhone OS 3.0
  2. Jailbreak your iPhone using redsn0w (this will also install Cydia)
  3. Run Cydia
  4. Please add the repo repo666.ultrasn0w.com to Cydia. That last “o” is actually the number zero “0”! If you use the letter “o” you’ll get an error.
  5. Search for ‘ultrasn0w’ in cydia or icy and install ultrasn0w
  6. Reboot your iPhone 3G
  7. T-Mobile USA users should disable 3G before using ultrasn0w
  8. Enjoy

Here is a demonstration of ultrasn0wsoftware jailbreak and unlock for new firmware 3.0.