Compressed IFS

Hi,
Can anyone drop me some hints on how to mount/manipulate content of IFS?
I have a bin that supposingly is IFS with some part of it apparently DEFLATED as there are two places in it with iwlyfmbp string - same that DEFLATED file starts with.
Unfortunately I can’t DUMPIFS it (says cannot find header) no mount it.
It starts with EB 7E FF 00 01 00 09 00 00 01 2A 00 60 3C 01 88 00 00 00 80 00 00 01 08 00 00 01 08 04 40 16 06 08 D1 00 00 E0 9B 9E 02 00 00 00 00 FC 6E 15 06 00 (…)
I would apprecieate any idea on where to start, search, what to check and what to do to finally get some files out of it and put them back when done.

All the best
K