I own a Samsung Galaxy S3 (SCH-I535), Stock ROM, rooted, running android 4.4.2
For a while now, since updating to 4.4.2 through OTA, I have had horrible battery life. Android System constantly uses 20%+ of the battery life, and can get to upwards of 40% for no apparent reason. I made an attempt to factory reset, but I messed up the backup process, and lost a lot of data. I decided to root the phone and explore other options for saving the battery. The factory reset hasn't worked, and although using some root-worthy apps like Greenify and others, nothing has helped significantly.
I asked a question on Android Enthusiasts a while back about this battery issue, and a user replied saying he experienced the same issue, but he fixed his by doing a manual install (through a PC connected to the phone with USB). Apparently the OTA update can get messed up somehow. I want to try this but I'm running into some issues.
When installing the Samsung Desktop Update Utility (or whatever it's called), it installs, but will not run. As soon as I run it, WerFault.exe also runs, and then they both close a few moments later. So this option is out.
Now, I moved on to Kies. I installed this program since it was said I could update this way. But, I see a lot of people saying that Kies is unreliable. The alternative is a program called ODIN.
What could my issue with the Samsun Update Utility be?
Is Kies a reliable way to do this process? Or will it brick my phone as I so often see?
Is ODIN a reputable and competent alternative?
Any help is appreciated, and I can provide whatever extra information is needed!