[Galaxy S III Q&A, Help & Troubleshooting] einSelbst:
Hi, this is my first post here.

I have an unbranded international Galaxy S3 GT-I9300, Android 4.0.4

Kernel Version: 3.0.15-928452-user

se.infra@SEP-107 # 1

AP: I9300XXBLG8

CP: I9300XXLG8

CSC: I9300DBTBLG6

Long story, so I better put my questions first:

How can I flash a non-rooted device without using the USB port? SD-Card somehow?? Download mode is working at least...

and/or

How can I remove a Super SU system app from a apparently non-rooted device? (...which can not be rooted by using the USB port)

What happened:

I had rooted my device via this instuctions: http://xdaforums.com/showthread.php?t=1695238

-> [03.07.2012] CF-Root 6.4 - SuperSU+CWM5.5+CWMManager.

I used heimdall 1.3.1 on Ubuntu 12.04 via 'sudo heimdall flash --recovery recovery.img --cache cache.img'

All worked fine.

When the latest OTA firmware showed up a couple of days age (45,76MB) I tried it and it failed at 29%.

I remebered I had deleted some bloatware and thought maybe bringing it back would make the OTA work. Because I coudn't find Samsung Video Hub at some point I thought it would be the easiest to just factory reset, then run OTA and reroot.

I made lots of backups with Titanium Backup ROOT and I rolled back the BusyBox changes. I also reverted some later installed App to a non-system App again but am not sure which one, it was not Super SU, maybe the terminal app.

I then made a factory reset from within Android, on reboot CWM appeared and I choose the single one 'yes, delete all data'

After rebooting I tried to apply the OTA, still stuck at 29%

I realized that there ist still Super SU left as a system app and thought that might be the reason. However I decided to first give Kies a try with the update.

Installing Kies and connecting the phone (via my gf's Xperia Ray cable) went fine and it showed me the update. Because of memory shortage I had to move some things around, time passes, my gf sit down on her office chair and somehow remaind hanging on the usb cable,

my phone fell down. At first there doesn;t seem to be any problem, but after trying to reconnect to Kies, it didn;t work. I found the USB cable not working anymore, which means that no mobile is charged if connected via that cable now.

However I could not establish a connection from my phone to a computer again since then (original usb cable, another usb cable).

Not to Ubuntu (not recognized in heimdall), neither to any of 2 different windows 7 computers.

I know there is a lot of connection problems out there for S3, I cleaned the connector, and tried lots of stuff like not giving google account credentials after wipe, try different usb-ports, restart computer. Windows always says "Unknow device" now. Ubuntu, also heimdall 1.3.2 just says nothing.

Thats why I guess that somehow there is a hardware problem with the USB connector on the phone now. Charging and MHL is working. It also recognizes USB OTG cable, but not the things that I attach to it, it worked flawless before. USB Debugging on/off -> no difference. Also the option to switch MTP/PTP under Preferences->Storge->USB is gone (was there before my first reset)

As a side note, also WLAN is not working as before anymore, I always have to use a static IP to get connected to my FritzBox.

Because the ruins of SuperSU are still in the system I can not update. However the phone is not rooted as all apps I have tried claim. Reinstalling Super SU did not bring root back. It is there, it thinks the device is rooted but it is not. But I also can not get rid of Super SU.

So now, I can't use normal OTA update, can't reroot or use my backups, bc Titanium requires root.

I am stuck. Is there any way out? Or at least a direction?

Thank you for taking the time.

Silvio