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According to The Apple Wiki , the ECID is a 64-bit identifier that is unique to every individual System on a Chip (SoC) inside an Apple device.

: Essential for certain SHSH protocol tasks and firmware signing. How to Join:

To understand the exclusivity of the ECID, it helps to compare it to other common device identifiers:

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"Registration" of an ECID is generally used in two scenarios:

ECID registration is often used for unofficial purposes. Always ensure you are using reputable sources like The Apple Wiki