[Android Q&A, Help & Troubleshooting] keira2142:
Ok so I took a break from this for a while cos i got really busy and didn't fancy doing MORE work on my phone when i finally got a spare tic. However, I came back to it today and managed to find a magic combination.

I AM NOT RESPONSIBLE FOR BRICKING YOUR DEVICE, PLEASE FEEL FREE TO CRY IN A PM ABOUT IT THOUGH I COULD DO WITH A LAUGH.

The following is a guide for anyone having issues making the root stick on their GT-i9305 samsung galaxy s3 4G/LTE on android 4.3. DO NOT ATTEMPT THIS ON ANY OTHER OS VERSION, VARIANT OR DEVICE.

I noticed a particularly important piece of information in the following link: How to Fix Android 4.3 Jelly Bean Rooting Problem for Galaxy S3/S4/Note 2/3 - W0lfDroid

A superSu update. So i went there grabbed that package ( SuperSU Download for update package ) and started my grand master plan. If you would like to actually read what hte user said yourself, its in a quote bubble naer the bottom, just before the comments.

now. Using an important piece of information in a thread I cannot, for the life of me, find through my browser history (apologies) I grabbed a copy of pihlz touch which you can find in the following thread: [CWM][PhilZ Touch][GT-I9305] 4.00-b21 Touch â€¦ | Samsung Galaxy S III I9300, I9305 | XDA Forums

Now. grab yo-self a copy of busybox's supersu root How to root Galaxy S3 I9305 with SuperSU 1.02 - Samsung Update located on that page. Make a folder on both your phone's internal storage and external, name them both the same thing and something you will remember. For instanceI called mine Root stuff. I only do folders on each of them in case I can't extract from external for whatever reason, its not necessary. Put both the supersu update you downloaded earlier and the one you just downloaded from above, busyboxes root, into both of these folders if you did it my way.

To avoid having to reboot your phone an extra time, make sure you did the above step BEFORE moving on

First up, I flashed philz touch with Odin (ensure you have the latest version, use your PDA checkbox and be sure that auto reboot and F. reset time are checked). Next up, turn your phone off and boot into your magnificent (no seriously, this is amazing. Its like a GUI in todays BIOS's...) new CWM recovery mode. Go into advanced and hit reset permissions or something like that... My phone is downstairs atm and I CBF in going and getting it and rebooting. Note that I am unsure if this is actually an essential part of the process, this is something I did because I worried about the permissions on the phone after my, by KNOX's count, 15 attempted flash operations -_- More like freaking 20 thousand....

Now once you have done that, go back to the main menu and tap install zips. FIRST you select the actual root, supersu1.02 busybox. Next, select the extra zip file option and que the UPDATE supersu-v2.02 after the actual root package. Once you have done this, swipe to install. THESE TWO PACKAGES MUST BE IN ORDER!!!!

Thats all I did. My phone rebooted and I was able to use Root checker to conform the root, allowed access to supersu and no crashing. Finally. THat was way too hard.

Thank you for hosting the website gentlemen/ladies where we can all come and share knowledge.

all credits go to anyone/webpage I linked people to and the brilliant programmers that made the packages. And finally, a HUGE thanks to Google and Linux (from which android is based) for freeing us from the shackles of iOS.