Does anyone have experience with askey firmwares?

Hi!

I have an old Askey modem that I'd like to use for guests.

Problem is: It does not seem to work with OpenWRT (and similar).

But I managed to dump It's Firmware and extract everything (I guess) from it.

Jut to try things out, I tried to re-pack all files back. Using mkfs.jffs2 (it's a JFFS2 Big Endian Firmware).
On the other hand, my dumped file (with no modifications) works as is. My modem accepts it.

But it does not work.
Any ideas?