[Sprint Samsung Galaxy S 4 General] likearaptor:
You can get the latest tar file from http://xdaforums.com/showthread.php?t=2522810 or http://xdaforums.com/showthread.php?t=2258107. These instructions should not be necessary anymore. Please download the latest tar file from the links above and use Odin to flash them in download mode

This is for those who are getting contact boot loops on the Galaxy S4 logo

For those who are having a constant boot loop or stuck on the Galaxy S4 screen we (omariscal1019 and I) found a solution. After upgrading to MJA I started to try to get root working and ended up changing something that I shouldn't since it started to boot loop and get stuck on the Galaxy S4 logo.

I thought all was lost and put OctOS for now, waiting for the MJA tar to get posted, but omariscal1019 helped me out made a custom backup with Philz's Recovery in the TWRP format. I was able to successfully boot after restoring boot and system and then wiping data/cache (factory data reset). Here are the files omariscal1019 shared with me and we would like to share with the others in the same situation. I'll try to get more details in a bit up

Files:

Stock Boot and System in TWRP format for Phil'z Recovery: (md5 57e37aed44916899e9e3ec577b20ddc7)

http://www.androidfilehost.com/?fid=23203820527944845

http://rapidshare.com/share/3BD3F4435CCF89749B6AC27A0B81F4D1

https://mega.co.nz/#!UIs3ELza!duwyojcErqo7p8B9Daj16mypdFkSc1nyXEHTmjTxDp8

http://www.mediafire.com/download/119i9d4c0dcy617/system.ext4.win000 (system backup file only)

MJA Radio and Modem flashable in Phil'z Recovery (TWRP Format): (md5 e33d2b5fa1c6222915d8521fd9dfb1ce)

http://www.androidfilehost.com/?fid=23203820527944844

http://www.fileswap.com/dl/Gchsi8LKq6/2013-11-01.MJA.modem-radio-TWRP.zip.html

http://rapidshare.com/share/C0DE3F84798D8BCE1F1E6062B5551D84

MJA Kernel flashable in ODIN (md5 d73ae5ad211663d9f00d0de7f6402565)

http://rapidshare.com/share/55FCFA092BF579EC1DF444C3927D173B

http://www.androidfilehost.com/?fid=23203820527944997

MJA Kernel and modem flashable in ODIN (md5 6625d683a1f9908281bd785a8e3fac56)

http://www.androidfilehost.com/?fid=23203820527945292

http://rapidshare.com/share/701BCA5E1116F6558C131A0707AD2FA8

[*]MJA Radio and Modem flashable in Phil'z Recovery (Normal backup format): (md5 3e1153b4eb1913c9c6cca986c4239913)

http://www.androidfilehost.com/?fid=23203820527944843

http://www.fileswap.com/dl/bTakvZPpJ/2013-11-01.MJA.modem-radio-CWM.zip.html

http://rapidshare.com/share/C0ADA5659CFC964EE6236E86054F2894

How to Fix Sound Issues with MJA (Thanks KelevrA_8)

MJA Kernel (Flash in Odin): (md5 d73ae5ad211663d9f00d0de7f6402565)

http://rapidshare.com/share/55FCFA092BF579EC1DF444C3927D173B

http://www.androidfilehost.com/?fid=23203820527944997

Make sure to flash with Odin after getting your system to boot properly.

NOTE: This is for only those who can flash Phil'z recovery with Odin and successfully boot into that recovery to restore these backups. Use at your own risk and listen to what others say. We have confirmed that the system/boot works, but only by following the directions below. The modem and radio files are yet to be determined if they work...

Download the files and place them in TWRP/BACKUPS/110c8480 (not sure on the last folder name, that is what was in my TWRP backups folder). Inside that one (110c8480) place the 2013-10-31.21.01.21_JSS15J.L720VPUEMJA folder. So in the end you should have the following path: TWRP/BACKUPS/110c8480/2013-10-31.21.01.21_JSS15J.L720VPUEMJA.

One other reason on wanting to restore this system partition is this backup was taken after it was rooted. So after restoring this backup you will have a working root with no Knox messages :) Let me know if you have issues or questions

I just wanted to say a big thanks to omariscal1019, reverepats, and KelevrA_8. omariscal1019 for getting my the files to fix my phone, reverepats for letting us use some of his hosted space, and KelevrA_8 for finding the fix for the sound issues. :D Make sure you send your thanks to them.