I would like to know if it is possible to update my Samsung Galaxy S3, which is in 4.3 Jelly Bean, to 5.0-lollipop. And in this case, I would like to know :

  • If it is a good idea ;
  • Will my phone support it ;
  • What benefits it might bring me if it is possible.

I also would like to know the best way to proceed, to update my phone.

Thank you in advance.

Edit : I have a friend that has the same phone, and his phone updated itself. Why not mine?

  1. Yes, it's a good idea.
  2. Yes, your phone will support it. I've seen ROMs for the S3 (i9300) up to 5.0.2.
  3. Benefits include: security fixes, better stability, improved battery life, new features and a lot more!

To update your phone, I would suggest

  • rooting it (there's a lot of information on rooting over at the XDA Developers Forum,
  • flashing a custom recovery like CWM, and
  • installing a custom 5.0.2 ROM. There are lots of them on XDA, so I'd spend a little time having a read up on the various functionality available.

As for why your friend got the update: it's possible that he has flashed a custom 5.0.0+ ROM also.

  • Thanks for your answer, I found very clear tutos to update the S3. I will try it later and share my experience. Just for information my friend didn't flashed anything, his phone proposed him automatically few days ago. – Maxime Feb 20 '15 at 8:43
  • @Maxime No problem. I'd like to hear how you get on! I haven't used my old Galaxy S3 for a long time; thus cannot verify whether there is a Stock Update. It's possible that you will also receieve one soon (could be a slightly different model for the rollout procedure). I think you will find many benefits from using a custom rom nonetheless. – Alfie J. Palmer Feb 20 '15 at 8:51

Not recommanded! I tried it days ago on I9300 and the phone goes horribly wrong with some 5.x Lollipop specially 5.1.x :

  • Bugs and glitchs.
  • Heating problems.
  • Battery life problems.
  • App crashs...

I tested more than one 5.x ROM (Based one CM12,CM12.1,...) on it and the same result every time!! but it work so much better on i9305(with 2GB of RAM). for that i think it could be a memory problem. That's why, i recommande the stock 4.3 updated ROM or a 4.4.x kitkat instead..

Maybe you can try and share your results, but dont forgot to backup your Data first.

  • 1
    Welcome to Android Enthusiasts - thanks for taking your time to answer a question. It is however often useful to include links and references as sources for your answer. The current answer is just a suggestion based on your experience - there is nothing wrong with it but it would help if you add details - like which ROM have you been using - what problems were you having and is the developer aware of these problems. – benjamin Nov 2 '15 at 10:51
  • i'll keep that in mind :) but i tested more than one 5.x ROM on my ex-i9300 and the same result every time!! but it work so much better on i9305. for that i think it could be a memory problem. – Malek Boubakri Nov 2 '15 at 12:09

Would not recommend it. My i9300 had a lot of trouble running 5.0.2 (CM12) smoothly. Furthermore, batterylife decreased severely up to the point that the phone even discharged noticeably when actively used whilst charging. I ended up restoring a backup to 4.4 after two days of use.

  • I have an i9300 that runs CM12 and have no problems at all. – Ryan Conrad Mar 25 '15 at 18:33

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