Update Samsung Galaxy S3 – I9300 to Android 5.0.3 Lollipop

Step by step for installation

Rom managers

Root telefon

Clockwork mod

Enable debugging

Android SDK

Other

CyanogenMod 

How to unroot Samsung Galaxy S3 device

Because of warranty I needed to unroot my S3. After a lot of searching I found following articles which helped me to revert my phone to factory defaults.

Used software

  • TrianglAway¬†– tool for reseting flash-counter inside the android firmware
  • SamMobile – server with all Samsung S3 firmwares
  • Samsung Updates¬†– Official Samsung site with all firmwares