[Samsung Galaxy Mega] Zeuszoos:
Samsung Galaxy (SGH-M819N) MetroPCS Mega

This will take you from the Factory Stock JB 4.2.2 (Rooted) to the Factory Stock KK 4.4.4 (Rooted). This is an "Update" procedure, not a wipe!

The following are the steps for updating your;

Samsung Galaxy (SGH-M819N) MetroPCS Mega

...from Android Jelly Bean v4.2.2 to KitKat v4.4.4

This will update you, without losing your setup & settings.

Very Important! All of this must be done from/on a PC/Laptop that is running Windows (at least XP)!

And you will be using your File Manager to do everything here. There are no "installations". You will be running everything by simply double-clicking on it in your File Manager in Windows.

You may need the appropriate USB Drivers for your device. If your PC/Laptop is not recognizing your Android device, you can try finding them at the following links:

http://rootmyandroid.org/android-usb-drivers-for-all-devices.html

http://developer.android.com/tools/extras/oem-usb.html

The following is the method that worked for me and so I would advise that you follow the steps exactly as they're written. For example, I was using TWRP on my Mega, but when I tried using it to do the Rooting step, it did not work. Yet Philz Recovery did. You can switch back to TWRP afterward, but for now, stick with Philz until you're done with these steps.

Also, as another example, yes, there is a reason for pulling the battery and not letting it reboot in one of the steps and there is also a reason for rebooting it twice when told to do so, so once again, please follow the steps below exactly as they're written and you shouldn't have any problems. But of course, there are no guarantees and as always, "YMMV". :)

So anyway, here is exactly what I did (I wrote the steps down as I went):

01) Download the following files:

KK Stock: http://samsung-updates.com/device/?id=sgh-m819n

Tools: https://www.dropbox.com/sh/hyc76x6zh6ppxdv/AAB7H8yyEpdKPzi5WfY6US98a?dl=0

You won't need TWRP, but as I said, I included it just in case you wanted to switch to it afterward.

02) Create a temporary folder and place all of the above files into it (unzip the zip file into that same folder).

03) Take the back off of your phone, so that you can easily pull the battery out when the time comes.

04) Power Off your phone, then fire it up into "Download Mode", by pressing the;

Home + Vol-Down + Power

...buttons, all at the same time, until you see the screen come up (you'll know it when you see it) and then release all of the buttons. Then just tap (for a sec) the "Vol-Up" button and it will go into "Download Mode" (it will say it on the screen).

05) Run Odin3 and when it comes up, Plug your phone in via the USB cable that came with it (using a different cable may cause problems). Your phone will show as being connected, because right below the top left box in Odin, it will say "COMx" (x=#).

06) Now click the big "AP" button in Odin (this is what used to be called the "PDA" button) and browse to the file named;

M819NUVUBNI5_M819NTMBBNI5_M819NUVUBNI5_HOME.tar.md5

...highlight the file, then click "Open", to bring it down into the "AP" box in Odin.

07) Now UNcheck both of the small boxes, labeled; "Auto Reboot" & "F. Reset Time".

08) In Odin, at the bottom, toward the right, click the "START" button. In the box on the top left in Odin, you'll see stuff happening. It should note what it's currently processing. For example, for one of the events, it'll say "System", as it's flashing in the System portion of the ROM, etc.. This will take a little while, so be patient.

09) When it's finished, it will say so in that same box. It will say "PASS", or "Finished", or something to that effect. You'll know if there was a problem.

10) When it has finished succesfully, Exit Odin. You'll be running it again, but closing it clears the screens in it, which makes it less confusing (to me, anyway).

11) Now pull the battery out of the phone, wait about 30 seconds, then put it back in.

12) Next, turn the phone on normally and let it boot into the ROM. Obviously, lots of stuff will be happening here, including (before you see your Home Screen come up) the black box that pops up, that says it's installing apps (or something like that) and counts through them.

13) When your phone does come up to your Home Screen, remember, you are NO LONGER ROOTED, so you will see lots of errors from apps that require Root not being able to do their thing!

You may also see lots of "Google Play Services" errors. Do not bother going into the Google Play Store, as it won't work either!

What you need to do now, is to reboot your phone. And when you do, you will see it counting apps again, but with a much lower number of apps to process. It is my belief that it doesn't process what would make up a "GAPPS" package (Google Apps) the first time around, but then it does it on the second reboot, since this time around, all of the Google stuff will work! :)

14) Once your phone has done the stuff it needs to do to finish booting up, Power Off your phone.

15) Run Odin again.

16) Boot your phone into Download Mode again.

17) Connect your phone using the USB cable and make sure that Odin sees your phone.

18) Click the "AP" button and browse to the file named;

philz_touch_6.25.0-meliusltexx.tar.md5

...highlight it and then click the "Open" button.

19) Make sure to UNcheck both the "Auto Reboot" & "F. Reset Time" boxes. It is very important that you do this, because Android's default behavior when it reboots after the following step, would be to overwrite the Recovery that you're about to Flash, with the Samsung Factory Recovery. That's also why you'll be pulling the battery to shut your phone off.

20) In Odin, click the "START" button. When it's finished, the top left box in Odin should turn green and it will say, "PASS". It may take a couple of minutes, so be patient. If it never turns green and you have waited, it is probably fine. Just move on to the next step. If you have a problem, then repeat the process, starting from Step 15 above.

21) Close Odin and unplug your phone.

22) Boot straight into "Recovery Mode". This is done by pressing and holding the;

Home + Vol-Up + Power

...buttons all at the same time. You will see some lines of text being drawn on the screen a few times, until the phone finally decides to reboot. Keep holding the buttons!

IT IS VERY IMPORTANT that you do not move your fingers away from their positions right now, as you may need to quickly press and hold all three buttons again and you will only have about one second to do it in! If you're unsuccesful, your new Recovery may be overwritten with the Samsung Factory Recovery and you will have to repeat the steps above, all over again!

If it does not boot up to where you see "Recovery" in tiny type at the very top left of your phone's screen, what will happen, is that the phone will shut off again. Release the buttons and your phone will start to fire up again.

AS SOON AS you feel the vibration that your phone does when it's first turned on, press and hold and three buttons again and then you should see it say "Recovery" at the top left ("Recovery Mode", or something to that effect). When you do, you can release the buttons. This may take a few attempts.

23) Once it boots into PhilZ Recovery, perform a backup (if you have an SD Card installed, you probably have more room there and should tell it to back up there).

24) Once the backup is done, you will then want to reboot your phone using PhilZ Menus. Make sure that it is set to check for Root (it will show you that setting) and then when it asks you if you want it to Root your device, make sure that you say "YES". It will then Root your phone and Reboot it! :)

25) When your device comes up, you will need to go into the Google Play Store and install "SuperSU". Please also support this wonderful, awesome app by purchasing the Pro version key as well! You'll get some more way cool features and besides, what else would you use? After you install SuperSU, make sure you go into it and when you do, it will detect "KNOX" and ask you if you want to disable it. Say "YES"!

Once all of this is done, just Reboot your phone one more time and that's it! You're updated, you're Rooted and you're ready to go!

If you want to install TWRP Recovery now, you can. I included v2.6.3.5, because it' the only version that I could get to work with this device. Just Flash it like you did PhilZ, starting at Step 15 above.

Now all that's left to do, is to check to make sure that all of your apps still work. I had a problem with about a half-dozen of my apps. But all I had to do, was extract the Apk's out of them and run them, reinstalling right over the current installation and every single one of them worked great afterward.

Enjoy and I hope everything goes well for you! :)