How to fix iTunes error 11 / 2003 / 3000 when downgrading iPhone 4 - GeekGrade

I'm still getting error 11 do you know why?

I tunes not working after installation showing that.itunes library.itl cannot be read

The error 2003 is from the wrong cable, not siftware related, if this error 2003 appears on the iTunes screen, . I used anUSB extention cable that was not compatible with the white cable that comes with the Ipad.

Thanks this is worked

i keep getting error 11 no matter what i try

In spanish please!

YOU ARE AMAZING!!! KEEP UP THE WORK DUDE!!

Yes finally no errors thanks George you are the best