yo everyone
well my 1st time post here.
about root and unroot.
root in easy word means you can gain the full control of your phone. for example for some app, you need to root to use. in hard word, go find at google
root do void the device warranty.
if your phone got problem and need to send back for warranty (hardware problem) just unroot the device and you good to go.
i got several easy way to root the phone with official firmware.
for example using ODIN method to flash rooted firmware, the most safe way to root your phone.
by using ODIN you can just simply flash back the original firmware, and the root is gone.
you can download the official firmware at www.sammobile.com
i just give some info, and wait for the TS to post bout the root thing

yup i later edit at 1st page..