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The 16 byte RC4 key used to decrypt parts of the EEPROM.

The key is passed to kernel from from 2BL. It is only initialized on cold-boot.

If an XBE is loaded which is not allowed to run in the manufacturing region, the Microsoft Kernels will set the EEPROM key to all zeros. As the key is not re-initialized, this means running the first non-manufacturing XBE (such as a game or Dashboard[FIXME]), will make the key unretrievable until a reboot.

The Chihiro EEPROM key is 7B 35 A8 B7 27 ED 43 7A A0 BA FB 8F A4 38 61 80