[Samsung Galaxy Mega] Zeuszoos:
Hi,

No, you do not need to go to KK first, but going from Factory to CM, a Factory Wipe (also Cache & Dalvik Cache) is recommended. You can back up your apps and their data to an Ext SD using Titatium Backup Pro (only 3 taps and; Yes! Buy the Pro version!).

Any more info than that and you'll need to go to the CM thread for yoyr Mega, because they can help you if you run into problems and tell you exactly which Recoveries (CWM, TWRP, PhilZ) will work with it.

I'm not saying this to be mean, but rather, to give you proper direction, when I say;

Your first question here (above) aboyt it, should be your last (here in this thread). Any real, quality help will (always) come from a thread specific to your device and issue. Not all are (most aren't) noob friendly though! So have thick skin and read the thread first for your answers! Because (good advice for all noobs!) if you go in there asking questions that have already been asked and answered a few times in that (or any) thread, expect to be immediately blasted and to see a bunch of torches being carried by an angry mob coming up your street at about Midnight that night! :)

Should you decide that you with to go up from (what I assume is on your SGH-M819N Mega phone right now) the Factory JB, to the Factory KK 4.4.4 (you will need to be Rooted first, no matter which ROM you install!), now that I can help you with!

I wanted to do the same thing, but in typical XDA style, no one had complete instructions, nor all the necessary download links!

So I figured it out for myself, writing down 30 quick (and easy to understand and perform) steps! I also uploaded the needed files to my DropBox account and supplied the links to them from there (my own account), so that I could know that the files will always be there for everyone! :)

I wrote the instructions with the; "What's a cell phone???" user in mind and have gotten compliments from noobs on the ease with which they were able to understand and apply the steps and you won't have even one of those moments of;

"Oh, crap! What does that mean?! Oh, crap" It doesn't say!"

.....followed by searching for hours for you don't know what, nor even how to!

I did all that grunt work for you and explained (always) in laymans (noob) ferms what you were seeing and I believe that it is a "zero stress" process, finally! <lol>

Sorry if this sounds like bragging. I'm just very proud of the result! Which result by the wa, except for the specific ROM & Gapps package links, can be used (the actual procedure itself)to install ANY Factory, or Custom ROM, onto ANY DEVICE (Phone or Tablet)!

The only difference, is that if you go from a Factory Stock ROM (like the device's original ROM) to a Custom ROM (CM, et al), you're supposed to do a Factory Wipe.

But with this one, you can UPDATE and keep your apps installed!

No guarantees, of course, but I'm running it and have used the same method I wrote up (with the appropriate files) to help a number of others Update/Upgrade their device's ROM/OS as well and so far, only 1 issue, 1 time, which was solved in under 10 min! :)

So the CM ROM is absolutely muxh quicker for performance and I can only say good things about those folks!

But if you decide not to put it on, I will give you thd link for my XDA thread for this.

Btw, you could try CM without a Factory Wipe/Reset and see if it keeps your apps there (just make sure to Wipe Cache(s).

What's the worse that could happen? You start having problems and end up having to Facgory Wipe it? You were going to do that anyway! :)

Hope this helped! If you're still awake, that is! :)