[Galaxy Note 3 Q&A, Help & Troubleshooting] yanniclord:
So you probably have the same problem as i had not long ago, you try using a Tool like Android Command, or SGN3ModTool, or kn0x0ut, or Android AIO Flasher or what not, and it just wont work, and you dont have any idea, why. The answer is pretty simple, yet very hidden and not thought about that much, i first figured it out very lately, and it took some time, so if you are one of them having one of the listed problems above, welcome to my help thread :D

Q: I get "Device Not Found"

A: Install the latest ADB drivers for all Android Phones, found here: http://adbdriver.com/downloads/

Q: Now i installed all drivers for my Device, but it still wont work. Why?

A: Are you pretty sure "USB Debugging" is enabled in the Developer Options? If not, enable it.

Q: I dont find the "Developer Options" on my Device. How do i get them?

A: I assume you got Android 4.2 or higher, since then, you have to press 7 times on the build number. Go to the "Device Info" tab, and scroll down to "Build Number" and press 7 times in a row on that, it will tell you, that the "Developer Options" have been enabled.

Q: Ok so now i did that, but it STILL wont work, WHY!?

A: Well then i guess you came to the points i landed at, where i didnt know the problem, lucky for you, i found the yet simple, but a bit "Im a Noob, idk that" fix. To fix this, first check your "SELinux Status" under "Device Options", if it is on "Permissive" then it should work for you now, and your good to go, if your in the situation of "Enforced", then you came where i was, no way. How to fix it? Easy, either you can try option 1 or 2. Or just ignore the fact its there and try finding out what it is, until you die trying to find it out :P

1: (This option might NOT work for some! Samsung Devices, i know it says all in the list, but Samsung Deviced without KNOX will work anyway, and some with KNOX even will, if you disabled KNOX with SuperSU or any other ROOT Tool). Install SELinux Mode Changer

App: https://play.google.com/store/apps/details?id=com.mrbimc.selinux&hl=de

After its installed, enter the app and change it to "Permissive". Reboot your Device, and now try again to connect with USB ADB, it will work guaranteed ;)

2: Install a KERNEL that has SELinux status set to "Permissive" incase the first option does NOT work for you. (Samsung Galaxy Note 3 SM-N9005 ONLY!)

KERNEL 1: http://xdaforums.com/showthread.php?t=2540246

KERNEL 2: http://xdaforums.com/showthread.php?t=2471416

To be honest, i prefer the first KERNEL more, more options and also it has no bugs known for now, the second has some bugs, but less features, if you try staying close to STOCK.

That was all from me for now, if you need more info or help, your welcome to ask.

PM: Want to know what SELinux is? Here: http://en.wikipedia.org/wiki/Security-Enhanced_Linux

Short description: SELinux was invented by the NSA and MAC, to provide more security for Android system, to say it short: To simply **** up the life for Developers :P. "Enforced" means all request are denied instantly, so thats why ADB USB wont work, cause all requests to the Device are blocked. With "Permissive" this though, makes it so all requests are allowed, but logged and being watched, but still can be run, without problems.