Some of us have a tendency to keep anything binary that passes by our way.
A possible note of interest for the future:
For the KT2, PW3 and KV -
The complete, initial, factory install of "main" bootloader, kernel, and filesystem is safely tucked away on a private network server (at least one, probably two).
I (we) don't yet know if the "downgrade attack" protection applies to installing the **initial** factory update package.
Something that is planned to be tested in the near future (RSN tm).
We have to thank Lab126 for shipping those to us.
Edit:
A note for anyone trying to reformat the FAT32 user storage partition (KT2, PW3, KV) -
It uses a 8192 byte block size, not 512 byte.
That probably has to do with eMMC erase block alignment.
And the cluster size is 16 -
I.E: This FAT32 storage only assigns/frees clusters sized for a pair of (4096) erase blocks.