This is an X-Gold 618 baseband, which can be found in the IPSWs for iOS 4.2.6 and 4.2.7. Its inclusion is peculiar, as the iPhone 4 (iPhone3,3) does not use the X-Gold 618; it uses the Qualcomm Gobi chipset. In addition, this baseband appears to predate 01.59.00, which was the initial shipping baseband for the iPhone 4 (iPhone3,1).
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