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Root Can someone please, help me restore my IMEI?!

If you don't have a specific IMEI backup then there isn't too much you can do.
The only thing that may work is to factory reset and wipe your entire phone then flash your latest official firmware through Odin.
 
That's exactly what I have Done . I got the latest firmware from Samobile, but my model doesn't seem to be available now. Any suggestions on where I could download it?

Galaxy S4 (SGH-M919) T-Mobile
Kitkat 4.4.2
 
I appreciate the link very much! However, even though I'm running 4.2.2 and the link to that specific file is no longer there. I have a file that I downloaded a couple of days ago that matched the one for my version, but it didn't work for me. Can I download any of these files??
 
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I've used it to restore Null IMEI on a S3 .made backup with it on my S5 Active. Download and run software on pc. EFS portion uses ADB to create backup on rooted phones. Qualcomm portion also to make backup or repair.
 
I found it. Thanks! I just need to follow some type of instructions to perform this. By the way, do I need to root the phone first???
 
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Don't have to be rooted. If I tried to walk you through it while I'm at work from memory wouldn't be as accurate if we waited a few hours when I have access to my pc and notes. Your choice.
 
First, pull battery and write down complete IMEI number. Go ahead and pull sim card, might be OK but do it to be on safe side.
Boot phone then you need to put USB in diagnostic mode. On dialer key pad, type in *#0808#. This should take you to USB settings hidden menu. Write down what your settings are. Under USB settings MTP+ADB should be checked. You need to select RMNET+DM+MODEM then select OK. Should return you to keypad.

Next launch EFS Pro and select Qualcomm NV Tools and connect phone to pc. Hopefully you already have your USB drivers installed

Up top at available Com Ports, click refresh till a Samsung mobile USB serial port with a com number shows up then select it. Click on connect and it should ping your phone and show info.
 
Wow! You sure know your stuff :) I'll do this in about 30 minutes. I'm actually in the middle of making myself something to eat. I'll be back!!!:D
 
Thanks for waiting J... I got two small questions before I do this: Should I pull the micro SD card out as well? And, how do I put USB in diagnostic mode? I'm at USB settings right now and "AP" and "MTP+ADB" are selected.
 
I just pulled my SD card out and lost the majority of the menu. I'm rebooting now and leaving the card in.
I am now at the USB / USB settings screen and selected "RMNET +DM+MODEM"...
 
Almost everything went smoothly; however, the part where I needed to connect to my phone didn't work. There's an error that says, "Unable to send SPC to phone". Any ideas??
 
I tried using another USB port and chose it from the dropdown menu in the program and now, it says, "Connection lost" and right behind it I can see "Unable to send SPC to phone".
 
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