[Verizon Samsung Galaxy S III] cyndric:
Hello all! I need to know what has been done to my insurance replacement phone, and how I can safely update my phone to VRBMV1.

The short version...

I hard bricked my Verizon Galaxy S3 phone by installing a custom ROM wrong, I got an insurance replacement that came pre-rooted, has Clockworkmod already installed and I believe has an unlocked bootloader. Clockworkmod stopped the OTA Update, but I want the update installed. I need to know what to do.

The long, more informative version...

So, I wanted to increase the volume of my Bluetooth headset and after trying different apps and nothing working, I found some modded system files that had a great review that increase all of the phones volumes. The instructions said the phone had to be rooted. Well I rooted the phone and the modded files didn't work. So reading the reviews of the mod, people were saying it worked great with the OMEGA AOPK ROM. So I rooted my Verizon Galaxy S3 i535 phone and installed a the custom rom and hard bricked my phone. I didn't pay enough attention and installed a rom for an i9000 not a i535, at least I think that's what happened... Anyways, I got a new phone through my insurance and the screen wouldn't rotate, so they sent me a 2nd replacement. I got that one in the mail today and it appears to already be rooted, and possibly have an unlocked bootloader, but i'm not sure how to do the VRBMV1 OTA update now.

The first thing the phone did once I activated it was do an OTA update from Verizon, so I let it. Clockworkmod popped up and said it couldn't verify the publisher for the files it was trying to install and asked if I wanted to continue. I clicked NO.

So, since I recently found out what Clockworkmod was and know it's not stock on the S3, I knew someone had done something to the phone. So i'm trying to figure out what exactly has been done, and if it's safe for me to do the OTA update or not.

After searching this forum I found out I can use an app to see if the phone is rooted or not, so I checked it and the app say "root access granted". I also see an app already installed on the phone called SuperSU. So I now know the phone is rooted.

After searching more I found one way to possibly tell if the bootloader is unlocked is to restart the phone, if the Samsung logo goes away within 1 second you probably have an unlocked bootloader. The logo goes away instantly on my phone, so i'm guessing the bootloader is unlocked?

The rest of the phone appears to be the same visually and settings wise as my old S3, so I think it's the stock ROM. "About phone" says Android Version 4.1.2 - Baseband Version i535VRBMB1 - Kernel Version 3.0.13-861013 se.infra@SEP-129 #1 SMP PREEMPT Thu Feb 14 15:16:58 KST 2013 - Build Number JZ054K.I535VRBMB1. Putting the phone Download Mode says everything is "Official", whereas it said "Custom" just before I bricked my old phone.

Sorry this is getting so long. I'll get to the questions now...

From what I've read on the forum, it appears to not be a good idea to do the OTA updates. Without knowing what else has been done to the phone, how can I "safely" get VRBMV1 installed? It appears to fix some problems with battery life and 4G signal, so it would be nice to have.

I for sure don't want to brick another phone as my insurance most likely will not like me anymore. So i'm not sure i'm comfortable trying anymore custom ROMs that already have the update in them. Is there a way to take the phone back to factory with having any of the backups that may or may not have been done before the phone was modded?

Thank you very much!