K810i FAR+JDflash Questions

Hello,
I started using FAR + JDflasher, Because my K810i is CID53 (Unfortunately), in process
I noticed several things/errors, that shouldn't occur, or maybe its because of my CID.
So here we go (again):
1. When I open my phone directory FS->ifs->settings->accoustics-> <...> I try to copy my original accoustics, because I wanna change it a little bit, I Copy All the original accoustics files and drag it to Hard Disk folder, it doesnt copy. I dunno why, But I can only COPY from COMPUTER, not from phone to PC, maybe know why?
2. How about debranding CID53? Isn't it available yet?
3. Does Changing my camera drivers/ audio accoustics etc. do damage to phone firmware?
In several places I heard that with CID53 changing firmware's can damage phone firmware itself ( I think it's a myth, but still, maybe you guys know this right)

Thanks for answers...:)