No, not able for the moment, i am reading threads about copying regions to sd cards. I have provided some part of the fw that was already to my old sd card. I will be happy to make a full backup of the unit also to give to Kunix the possibility to work on this fw. But i can't figure how.

It's interesting that there are three levels of clearing data on the unit.
One is in the normal menu and affects only system settings Time, date, timezone etc. All will be restored to original settings but routes and favorites are still here.
Second is in the service menu Clear user nonvol and also for me it will erase favorites and routes and maybe satellite acquisition details forcing the unit to redo a search (so do this in open spaces and let enough time to the unit to re store the celestial data).
Third is the Clear all nonvol that, i think, fills the whole nonvol memory with zeros.