CHIP

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The CHIP tag is a 16-bit unsigned integer (uint16_t) that denotes the type of chip the firmware is to be installed to. It is used to prevent [supposedly] incompatible firmwares from being installed. A firmware is truly incompatible if it uses instructions only available on newer processors.

Processors

Recovery Mode string

If you connect a device in Recovery Mode to your computer, there is a small section in the device's USB "serial number" that contains the CPID, among other information.