Both the ota facilities were updated, as well as the factory updater itself.
The former lives in various libraries & binaries in the main fs, while the latter is embedded in the kernel's initramfs. (i.e., you'll need a decent disassembler in all cases, as well as the right script/method to pull the initramfs out of an uboot kernel image. There's a couple mentions of this over here, but I don't recall how well that worked with current kernels).
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