Oops, the mi4 magic was being looked for in the wrong place when decrypting. Also...
treeddd58b490555f91489b256a40b02c26756983d35
drwxr-xr-x - apps
drwxr-xr-x - bootloader
drwxr-xr-x - docs
drwxr-xr-x - firmware
drwxr-xr-x - flash
drwxr-xr-x - fonts
drwxr-xr-x - gdb
drwxr-xr-x - manual
drwxr-xr-x - rbutil
drwxr-xr-x - tools
drwxr-xr-x - uisimulator
drwxr-xr-x - wps