معلومات جميله عن الايفون 3GS من wikipedia
New Bootrom and 2011 Baseband Update
On September 9, 2009, Apple launched an updated model of the iPhone 3GS that patched a segment overflow in the SecureROM of the Device that had allowed loading an unsigned LLB.[20]After the release of the iPhone 4S, Apple killed the unlock for the new iPhone 3GS devices that were produced after week 36 of 2011 by updating its baseband hardware from an Infineon Baseband chip to a Toshiba Baseband chip. Although the new chip uses the same modem firmware as the Infineon chip, it cannot be updated to iPad baseband 06.15.00 that is still vulnerable to the AT+XAPP exploit.ng
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