a price to pay for being careless...

which stock 4.1.2 are you using now?

you might... try the older one...

What are you on right now? If you're hesitant to flash the official release due to Knoxy, why not use the Knox-free release that someone posted a page back? Either that or use OTA or use Kies to update the thing.

I've been off official releases for a LONG time so I really don't know if Odin-flashing the official MJ3 would trip the Knox counter or not, but IINM it might just.

No need stock rom. Try ARHD as per Eiraku and Chuahcs79 recommendation. Its really stock but really smooth.

Guys,

i taught this 4.3 will be solve my issue (not registered on the network/lost IMEI), but not.. 

N7100XXUEML3_N7100OLBEML1_XME --> not solve
N7100XXDMF2_N7100OLBDMD2_XME --> not registered on the network/lost IMEI
N7100XXDMC3_N7100OLBDMD1_XME --> No issue (Original IMEI)

Anyone have the same problem as me?

Hey bro u restored with a backup that u made after u already updated to 4.3 or u use a backup before the 4.3 update?

Before this i had tried any single methods that has inside here and XDA forum (EFS backup and restore method, flashed different firmware, flashed custom rom), but none of it successful. I still failed to retrieve my IMEI (lost IMEI 0049XXXX) or get my network ('not registered on the network' issue) working. The only way is, use older firmware which is XXDMC3 (4.1.2) and below (by doing this i have no issue with IMEI or network, everything is normal).

Then here it came, the 4.3 XXUEML3 pop up on my device (OTA), i am so happy that day and straight away perform an update and was hoping with this new firmware/update can help solve my problem. BUT, again my IMEI lost and cannot make a call and this time is worst, with this new samsung KNOX security, it won't allow my note 2 to downgrade to the older version and block ODIN (encounter error while flashing). It even triggered my device KNOX WARRANTY VOID to '1'. Hell yeahh. Hahaha. 

So i was stuck with the latest 4.3 firmware with IMEI broken hence cannot receive or make any call. 

Now this is good part. What did I do?

1. Flash custom recovery on my Note 2 (4.3) via ODIN.
2. Search for a XXDMC3 based custom ROM @ XDA and managed to flash the ROM via recovery mode and able to get back my original IMEI and phone work as normal (rooted). 
3. Reset custom binary download to zero/No ('KNOX WARRANTY VOID : 1' remained).
4. Flashed back to 4.3 XXUEML3 (with broken/lost IMEI).
5. Today went to Samsung service center @ Wisma Bently to claim for warranty. Tell the samsung staff/technician the whole story (except the rooting/custom flash part  ). And tell them that my knox triggered due trying to downgrade to the older firmware since i have broken IMEI with the latest samsung 4.3.
6. They open a case number for me and ask me to wait for a while. After 30min, my phone is ready. I have back my original IMEI with the latest 4.3 firmware. 

I did asked the technician what is the problem. He said my device's modem having a problem to read the latest firmware hence make the IMEI lost but it is only a software related issue. 

Btw, i am so glad that my problem solved and have a chance to taste the Kit Kat sooner or later on my note 2 (if any laa  ) For your guys info, my warranty will be ended @ 5th Jan 2014, just around the corner bro, fiiuuhhhh 

No problem. Me too, at first decided want to layan 4.1.2 only until forever.    but since my warranty will ended soon (2days from now), so why not gamble away and give a try.   

But the technician did check the custom binary count via download mode..huhuhu..in front of me..

MY long charging problem is here again. Took me 8 hours to charge 60%.

I am not sure whether its the charger problem. Any idea where can I get a replacement charger or maybe just the cable? Already out of warranty.