Sunday, 26. August 2007
Topic: Phone - on August 26, 2007 at 5:09:00 PM CEST
iPhone unlock howto posted
Here how the bootrom check works; it reads from 0xA0000030 0xA000A5A0 0xA0015C58 0xA0017370 and all these addresses must read as blank, or 0xFFFFFFFF. When you erase flash, it becoms 0xFFFFFFFF. But you can't erase those locations, because they are in the bootloader. So thats where the testpoint comes in. Pulling A17 high hardware OR's the address bus with 0x00040000(offset one because data bus is 16 bit) So the bootrom instead checks locations 0xA0040030 0xA004A5A0 0xA0045C58 0xA0047370, which are in the main firmware and can be erased.
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