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QUOTE(rosmanpositivo @ Dec 29 2013, 03:02 AM)
Previously I've faced this issue, and managed to solve it (Refer to my previous post in this thread)
But...
That was before I flashed the official 4.3 with Knox. I only used Dr Ketan's 4.3.
If you have flashed the official stock 4.3 with Knox, not sure the proper solution. Maybe some people in XDA solved it?
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