The processor chip serial number is burned in.
That's the one you get back with EDL, not the one you see on "adb devices".
I've never really dived into stuff like IMEI, but on phones I believe that's all in signed partitions that you can't really patch yourself.
I've been working on these incremental updates. I've patched the updater so that it doesn't reuse free areas of super. That makes the needed "elbow room" 3.5 GB. I've tried using vfat, exfat, ntfs, ext2, ext4. I'm still working on this.
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