I understand the possibilities and bricks of flashing yada yada yada been there, bricked my psp etc

But with this GDFS dump, am I able to restore the phone from the majority of circumstances if something goes wrong? Is it like a nand-dump?

What do you need a dump?

You can backup your GDFS using XS++v3.....

I know, but what i'm asking is that by having this backup am I able to restore my phoine if all goes wrong?

and one last thing: you wouldn't happen to know if theres a patch to unblock a w850i to all sims? The w830i is a v.similar phone but I can't seem to find much for that either...

Yes, afaik you can save your phone with that.

No free patch support for these phones ~ Yet

i dont know about 'free' patching to unlock but there is patches for unlocking W850i available on some software/hardware

by hardware you mean a service cable right?
what do you mean on the software side?