If you root your Android then you’ll lose your warranty. So be careful and do at your own risk..

Process :

  • -Instal Samsung Kies in your PC.
  • -Open Odin 3.07.exe
  • -Put your phone into Download Mod (Power button-Home button-Volume down button,at same time)
  • 2
  • Press Volume Up Button
  • 3
  • -When you enter in Download Mod, you should get blue box on Odin 3.07
  •  4
  • Uncheck Auto Reboot option
  • -Go to PDA and find your recovery, then click on OK
  • 57
  • -After you checked everything click on Start
  • 6
  • -It should take around up to 30-40 seconds
  • -When its finished take out battery, put it again
  • -Go to recovery mode (Power button-Home button-Volume up button,at the same time)
  • 8
  • -Navigate with Volume Rockers (Volume Up- Volume Down)
  • 9
  • -Select via Power Button
  • -go to install zip from sdcard
  • -Find root package, and install it via pressing power button
  • -go back and reboot system now
  • 10

DONE ! You have rooted your s2 plus ! Download Link :

Source : Xda, androidxda