Few days back we had published guide to downgrade iPhone 3G 4.0 OS to 3.1.3, now that we have Redsn0w 0.9.5 tool to jailbreak iPhone 3G OS 4.0 you can use Fuzzyband Downgrader Cydia app to downgrade iPhone 4.0 OS baseband 05.13.01 only if you have iPhone with bootloader 5.8.
The beauty of Fuzzyband Downgrader is in its simplicity and easy to use, with just one single click this app will detect bootloader and baseband version and will downgrade iPhone OS 4.0 baseband 05.13.03 to unlockable baseband version making it easy to unlock iPhone running OS 4.0 beta 1.
How to Downgrade iPhone OS 4.0 Baseband 05.13.03 Using Fuzzyband Downgrader
1. Launch Cydia from your springboard, and go to systems under section tab
2. Press to select 3G Fuzzyband Downgrader from the list of packages & click on install.
3. After installation is completed successfully return to cydia and press home button and launch Fuzzyband.
4. A message will be displayed if your bootloader is not supported, If you have the 5.08 bootloader you will be able to downgrade from baseband 05.13.01. Press the Downgrade button to begin downgrading your baseband.
5. Once the downgrade has completed successfully you will be displayed a Done! message saying, “I Haz Downgrade!”
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