This is the bootrom version found in both variants of the iPhone 5. This version was compiled after 4.3.3, but before 5.0b1 and is the last bootrom version alongside 1145.3.3 to require the old type of SHSH blobs. It is vulnerable to Checkm8.
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The first significant code that runs on an iOS device
Signed hash, a cryptographically signed string that certifies that components of the boot process are allowed to run on the device