[AT&T, Rogers, Bell, Telus Samsung Galaxy S III] chevrolet1234:
Hello everyone,

I want to start by saying that this is my first post on xda, having just signed up a few minutes ago. I tried to search for any inquiries that were similar to mine, and couldn’t find any, but I may have missed them so I apologize if that’s the case, and I’m really not even sure if this is the correct area to post this in. Once again, I’m sorry if it’s not right. I also should say that I’m not very knowledgeable in the area of rooting, and flashing roms, and I’m sure that you guys know much more than me. That having been said, you’ll have to bear with me and my lack of understanding if that’s okay, as I’m pretty limited. I've encountered a problem with my GS3 (Galaxy S3) today, where it now gets stuck in a boot-loop every time I try to turn it on. Prior to that happening, I was running the stock, unrooted AT&T android version that was released in May (4.4.2 I believe?), and I had been having a lot of problems with performance and battery life. But as I had had the phone for over two years (I bought it in November 2012), I simply thought that it was slowing down and I thought it could possibly stop working, but as I said, I’m no expert. Back to earlier today, I was using the phone as I normally do (texting, light web-browsing, etc.), when I heard the notification tone indicating I had received a text. I picked up my phone, pushed the lock/power button to turn the screen on, and it said something to the effect of (I wish I had written it down, but I didn’t think to at the time) “software broken, you’ll need to factory reset your device” (that’s very much just my recollection, so I may have it completely wrong), along with a prompt to reset it. I touched that, and it just shut off. I tried to turn it back on, and it would keep shutting off after about 15-20 seconds. But I was able to get it into both recovery and download mode – just not booted up. So I thought to (probably stupidly) try to flash a rom, and I’ve tried several since that time (my phone won’t mount as a device on my laptop, thus preventing transfers, though I was able to get around this by using a micro sd card adapter and putting the card in that, then transferring the files to the card). But the first I tried – and was successful in flashing was called AOKP 4.4.4 (Kitkat) made by Task650 from 9-10-14. I’ll try to post the link to the thread that I used to research it. http://xdaforums.com/showthread.php?t=1766684. As I’ve always been on touchwiz, I found out after I flashed it that I had to download the gapps package, which I tried to do from this link https://plus.google.com/+SeanHacker/posts/AGq2b8YwjXB . I downloaded that and tried to flash it by following this guide http://android.stackexchange.com/qu...he-gapps-package-after-installing-cyanogenmod . I’m sorry if I’m not organizing this in the right manner, but I’m doing my best! So anyway, I installed it from zip within clockwork mod recovery and then cleared the cache and dalvik cache afterwards, as the person in the above link said to. Then, I tried to reboot and that’s what I got stuck in the boot-loop. I left my phone for 30-35 minutes thinking it might’ve been taking awhile because I’d just tried to install the google apps. But it never did seem to do anything. Since that time, I’ve tried installing the stock rom (which I downloaded here: http://stockroms.net/file/GalaxyS3/SGH-I747/StockROMS.net-SGH-I747_ATT_1_20120522193451.zip) through odin and the recovery mode installation, cyanogenmod 10.2.1, and synergy r484 ( http://downloadandroidrom.com/file/GalaxyS3Verizon/roms/Synergy/Synergy-S3_19Apr13_1622_r484_s.zip ), all of which have been unsuccessful. The closest I got to being complete was going through the aroma installer for synergy, before trying to install and getting the message “Something was not successful during rom install. You will likely have a non-booter if you see this. If it constantly happens press save log in aroma and report this in xda thread.” (I didn’t know how to save the log and post it here). So that’s about everything that’s happened up until this point, and I apologize if my rambling is hard to follow lol. I just didn’t know what else to do. I’m very scared that I’ve bricked my device and that it won’t work anymore. I’m out of ideas, so I would greatly appreciate any and all help and/or input! Thank you very much for your time!

* Here is the link for the multi-window guide: http://www.howtogeek.com/189345/how-to-get-multi-window-multitasking-on-any-android-phone-or-tablet/