Default [Q] Help to flash Note 2 with stock ROM 4.3

Hello

I decided to try jedi master x2 (the version of my stock ROM was 4.3). After trying it out for a while I noticed poor battery performance and when phone was locked I had to press the menu button several times to see the screen. Yesterday my phone was booting up by itself. It did a couple times then got stuck with the samsung logo. Reboot again and again and the same stuff happened that's when I decided to flash stock rom from samsung.updates/device site using odin3 v3.09 however, I have not been successful. After it checks the md5 OK, it fails on the NAND write. Is it the case that the NAND memory is not unlocked? I am still able to boot into recovery though. I'd appreciate if anybody can land me a hand on how to flash stock rom on my device.

Thanks

** Update to the issue above 1/13/14 8:24 AM

I use ODIN 3.09 to upload the md5 I got from samsung.updates.com I get this:

<ID:0/004> Added!!
<OSM> Enter CS for MD5..
<OSM> Check MD5.. Do not unplug the cable..
<OSM> Please wait..
<OSM> T889UVUCMK7_T889TMBCMK7_T889UVUCMK7_HOME.tar.md5 is valid.
<OSM> Checking MD5 finished Sucessfully..
<OSM> Leave CS..
<ID:0/004> Odin v.3 engine (ID:4)..
<ID:0/004> File analysis..
<ID:0/004> SetupConnection..
<ID:0/004> Initialzation..
<ID:0/004> Get PIT for mapping..
<ID:0/004> Firmware update start..
<ID:0/004> SingleDownload.
<ID:0/004> boot.img
<ID:0/004> NAND Write Start!!
<ID:0/004> FAIL!
<ID:0/004>
<ID:0/004> Complete(Write) operation failed.
<OSM> All threads completed. (succeed 0 / failed 1)

I am able to boot into recovery mode. I have not tried to upload any other ROM to my sdcard and install it there. The stock ROM I had before was Android version 4.3.

I read this post http://forum.xda-developers.com/show...2470262&page=3

then I looked at my device and read the following:

custom binary download: Yes (1 counts)
current binary: custom
system status: custom
knox warranty void: 1 <--- I think that's the problem

As you may know knox is a security feature which helps you to securely separate your personal and professional data. Well, in my case is not helping at all.

Another question: How am I going to remove knox with my phone only able to get into recovery or download mode?