OK, here's the result. I used the original (non-packed) fw_all.bin:

- As of offset 0081BF00, fw_all.bin is empty, where 14.bin contains only FF's up to and including offset 0087FFF0.
- The only real difference found, is in offset 00000010. fw_all.bin reads 0C 80 A0 E1, where 14.bin reads 0B 80 A0 E3. See screenshot below:

SG0UBHe

This difference looks a bit like step 2 in post #4, but there 0C 80 A0 E1 in the original file is changed into 0C 80 A0 E3 (the 0C at the beginning is left unchanged there).
What does this indicate? How did the 0B end up inside 14.bin?