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Difference between revisions of "ECID"
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| + | The '''E'''xclusive '''C'''hip '''ID''' or '''ECID''', is an identifier unique to every unit. |
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| − | The '''Exclusive Chip ID''' or ECID, is a 3GS device specific numeric identifier which is sent to Apple during a restore. The ECID is included in a new, device specific, signed img3 file and sent back to iTunes for the restore process to proceed. |
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| + | == The Img3 Tag == |
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| − | The implication of this is Apple could dissallow downgrades (even via DFU) on newer devices and even on older devices once new firmware is released. |
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| + | With the [[iPhone 3G S]], the ECID tag with your ECID is put in the signature checked section of every firmware file, and sent to Apple's servers for re-signing. |
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| + | The implication of this is Apple could disallow downgrades (even via DFU) on newer devices when a new firmware version is released. |
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Revision as of 16:01, 26 June 2009
The Exclusive Chip ID or ECID, is an identifier unique to every unit.
The Img3 Tag
With the iPhone 3G S, the ECID tag with your ECID is put in the signature checked section of every firmware file, and sent to Apple's servers for re-signing.
The implication of this is Apple could disallow downgrades (even via DFU) on newer devices when a new firmware version is released.
