Samsung GT-s5660 root failed. How can I get this working?

A

AC Question

Samsung GT-s5660 root failed. Please help..

I tried to root my GIO phone according to a guide "HOW TO: upgrade your Samsung Galaxy Gio GT-S5660 to Android 4.2.2 (Jelly Bean)" (the system here doesn't allow me to put links) and it failed already in step 3.a.
The phone restarted and get stuck with the logo "SAMSUNG" on the screen (trying to boot) but does not change even when I patiently waited over 10 minutes.
What can I do to update it or even get back to factory OS?
Thanks.