mobile

Okay so to start I followed this Tutorial http://forum.xda-developers.com/att-galaxy-s5/general/how-to-root-g900aucu2aoa1-4-4-4-2-3-2015-t3021120 all the way through and my phone was rooted and I was happy. One day I tried to install TWRP since this is what I used on my Galaxy s3 before this phone. It got stuck on on a boot loop. I eventually tried flashing every stock ROM which did not fix the problem because ODIN would fail when trying to flash. Eventually I tried flashing the "G900A_ND3_Stock_Kernel" supplied in the tutorial. My phone magically booted up and all my APPS and stuff was the same as I left it and it was still rooted. I decided not to mess with it anymore. This happened about a month ago.

Today, my phone had a notification saying that there was an update and I tapped remind me later. Eventually, I installed Titanium Back up to force closed the AT&T Software Update app the phone came with. Then. it automatically updated and eventually got stuck into the boot loop again. No problem, I fixed this before. What I noticed from the first time was that I had a screen that said "Secure Fail: Recovery. System software not authorized by AT&T has been found on your phone. Please turn off your phone and go to the nearest AT&T store for help" Once I flashed the stock kernel from the tutorial I never checked to see if the recover menu was there.

So right now I have my phone working and its rooted. I installed the "Phone Info" app and it says Bootloader Version:G900AUCU2ANG3. Eventually, my phone will try to update itself again and it will fail causing it to boot loop. I am not sure on what to do. Is there a way for me to have my recovery menu back? I just want to have the option in the future to revert everything back to normal in case I sell it or feel like having the newest OS. Also it would be cool to have a recovery menu on my phone again.

I know this was long but I needed to solve this problem before it gets out of hand in the future. Also I am pretty sure others have followed the tutorial and might have had the idea to update the OS or something else and had a problem similar to mine.
Thank You Very Much.