aCujo.com has created a Bootloader for those of you who feel confident enough to try something as crazy as this on your iPhones. In a nutshell it allows you to downgrade your 4.6 Bootloader iPhone to 3.9 Bootloader, this will open the door for a multitude of unlock options, and in the future custom bootloaders/basebands and unlocked firmwares.
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Downgrade Your Bootloader - Software Only - Guide by aCujo
