A-haaaa! Great info, thank you so so much! i don't think I've read enough to find that info about snapshots=no Luci. Fantastic, I'd buy you a a beer for this .
So, next step, how to do this without internet connection on OpenWrt and only Windows OS.
Thank you al for your inputs, they were very valuable and I've learned a lot!
I am abandoning the modification as I couldn't bring it to the internet and can't be bothered anymore with additional downloads and modifications, simply too much time for little gain..
As a note, do NOT USE WINDOWS FTP to transfer snapshot but any Linux distro (even bootable live distro works) as it will not transfer the snapshot correctly (passive mode won't trigger).