Sorry my english is a little bad.
Which version of the firmware is currently installed on your unit?
You might want to try to install the latest Z140 update after taking a backup of your unit.
Ps. I'm French, in case you are too and more confortable communicating in French.
already back up like an idiot in the first place
I wanted to update 940bt the file system in this state , "wrong sdcard , Please the correct insert sd"
Do you have a way to delete these folders?
delete folders, I want to add that I've downloaded folders!
Well, if you did "backup like an idiot", shouldn't you have your old NDATA folder somewhere?
"Do you have a way to delete these folders": You said you accidentally deleted the NDATA folder. You should have enough experience to delete any folder by now 
For the "wrong SD card" message, make sure the SD card doesn't have ANYTHING else than the update. If the unit picks up something else, it might understand that it's not an original Pioneer update and show this message. Have you tried this update?: http://avic411.com/index.php?/topic/35230-2012-uscan-maps-cnsd-310fmuc-upgrade-updated-to-supereasymethod-beta/ That's the one I used to upgrade my x930bt and it worked like a charm.
NDATA intact folder before updating it worked flawlessly 
I solved the problem.3.001 (z110bt) I did upgrade from the official website,
Glad to hear it.