Root Samsung Galaxy Star Duos - GT-S5282/5280

                              

Download the following files 

"KEEP IN SD CARD DIRECTLY NOT IN ANY FOLDER" 

- reboot your device in recovery mode.. HOW? 

HOLD - VOLUME UP + HOME BUTTON + POWER BUTTON 

Till u get in the recovery mode.

then using The VOLUME BUTTON scroll "up-down"

select - apply update.zip from sd card

scroll down using volume down - select downloaded file

select - YES

And done your phone is rooted!!

Reboot your phone.

Report at this Link if this this not working as its not tested by me.

Links: Download here 

Credits :mjp93

For Reference you can see the below video: