Thử cái này xem sao. Mình search trên Internet thấy có nhiều cách giải quyết lắm mà
Allright, I just called Apple myself, Heres what you do...
*Press And Hold The Power Button and "Slide to Turn Power Off" COMPLETLY
*Next, Hold the home button and DO NOT LET GO a little message should pop up.
*Still holding the home button, Plug your I-Pod Touch or I-Phone into your computer you've registered with.
*It should say "recover I-Pod, keap holding that button after that just follow the steps on your computer, your music data everything will still be stored on your I-Pod except your passlock.
Don't Believe Me? Call Apple Your Self.
www.apple.com find the "Costomer Support Button" and call.
Have FUN with your I-Pod
***NOTICE*** THIS WILL NOT WORK WITH STOLEN IPODS. DO NOT ATTEMPT TO TRY, THEY WILL FIND OUT YOU'VE STOLEN IN, IT ONLY WORKS ON THE COMPUTER THE I-POD OR I-PHONE WAS ACTAVATED ON ***NOTICE***