update or restore

Hi, i'm having a problem when I want to update/restore my jailbroken iPad. It shows this error message "error 12" Does anyone knows why this thing happened and how to fix it? Thx

http://i43.tinypic.com/29ux4ci.jpg Help?? No response to redsn0w, tinyumbrella, itunes, hard reset combo nor dfu combo...

http://i43.tinypic.com/29ux4ci.jpg Help?? No response to redsn0w, tinyumbrella, itunes, hard reset combo nor dfu combo...

Ok so basically i just got an iphone 3g from a friend of mine today and the firmware on it is 4.1 and i was able to unlock it by redsnow and it worked completely fine i even talked to my friend for 10 min, and then i decided to put some songs on the phone through itunes which when i connected my...

...become locked again? PS i've lost the cydia app.