[Sprint Samsung Galaxy S 4 Q&A, Help & Troubleshoot] ProFragger:
Dear Friends,

I just bought a Sprint S4, and despite my half a decade experience of flashing custom ROMs and such, I seem to run into a whole lot of issues with this phone that I cannot solve or get past.

So some background first, on what's happened and been done to the phone:

1. Bought the phone (don't recall the original firmware), but Rooted it via the QBKing method.

2. Flashed TWRP 6.1 something from the GooManager

3. Have a Class 10 SD 64Gig SD Card that I formatted via S4, so I assume it's in the ExFat format?

4. Downloaded Sacs, put the ZIP on the SD

5. Booted into TWRP, Wiped, Data, Dalvik, Cache, and System

6. Tried Flashing Sacs ZIP from SD, Errored out: Something like: Flash failed, unable to read the Zip file. And some verbiage for Partition

7. I can't Mount my SD or INTERNAL via Recovery. Can read them from the Recovery file Manager, but nothing shows up on the computer, unrecognized drivers (worked fine for the same phone, later, when it was on, so I know it was the drivers that was the issue)

8. Ran straight for Odin after that, but after trying SEVERAL TARs and etc, the phone would NOT begin flashing with Odin even :'(! (Could still enter Download Mode)

9. After HOURS of trying VARIOUS Odin versions and TARs, I found a One-Click EXE with Odin Packaged with the MDC Rooted firmware this FINALLY brought the phone back to life!!

Now the issues remaining that I need your expert help and advice on:

1. Since the phone coming back to life, I went STRAIGHT for Sacs ROM again! MD5 checked it, everything looked good. Put it both on SD and Internal.

2. Made Backups of the MDC ROM

3. Tried Flashing and ran into the similar error that you saw in Step 6 from the Backgroun

4. Downloaded Stock, DeOdexed MF9 ZIP, downgraded TWRP to a stable version, and tried Flashing again and Step 6 repeated. Tried VARIOUS ROMs this way, same issue. Error flashing, something about Partition, and Couldn't read Zip. All these Zips were MD5 Sum CHECKED!

5. The lack of mounting issue as USB drives from Recovery continues

6. Then a FREAK discovery was, when the ZIP failure occurred, I opted for Flash Dalvik and Cache and tried Installing right after that, and BOOM! Sacs starts Flashing :D!!!

7. I broke Sacs quick, restoring things from Titanium Backup, and when I tried restoring my latest MDC Backup, it recovered with a black screen and bootloops, and NO recovery entry AGAIN :'(!! (I think I may have backed up Recovery with that Nandroid and restored)

8. So I repeated the One-Click again, the phone restored again... this time in FACTORY MODE :-/?? I ignored, and restored to an older MDC backup, which worked!

9. I downloaded TriForce MF9, this time, tried flashing and failure again with Failed Flashing, error reading Zip. And on and on it goes :'(! I can't run Odins with MF9, I can't flash ROMs, I can't mount my INTERNAL AND SD in Recovery and am just straight bummed :'(!!

I have a few hunches:

- Format SD Card as Fat32, using this one app. But I think you lose 32 gig space from your card, right? Also, why doesn't Internal storage mount from Recovery :-/?

- Maybe a I just have bad or corrupted sectors in my Internal AND External storage devices?

In either case, please treat me as a NOOB, and chime in with your thoughts and experience on what you think could be happening? I appreciate ALL your help in advance, thanks for your time :)!