Executive Summary:
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3) Somebody from Google/Asus screwed up royally and put the OTA (preamble-prefixed) bootloader file into the JWR66Y (full) factory Image; similarly the bootloader ".img" file in the KOT49H image is also screwed up - it starts with "BOOTLDR!" rather than an arm objcode near branch ("ea000010 == b[ranch] 48"). It is also a wildly different size than prior bootloader .img files. What's up Google?
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They didn't fix the KOT49H image right? It has still a bootloader different than all the others?