Just sharing my experience in solving this issue. Hopefully it will help solve those who have similar issues.
I flashed a file which messed up my EFS partition. I had a backup and tried to use the available programs to restore my EFS using my backup. None worked. I even brought it to the samsung store, but they said they would change the motherboard and reprogram, and replacement and service would cost more than half the cost of a new N7105. I purchased the phone in another country. The people who had stores to repair phones gave up on my phone. They also offered to replace the motherboard for US$175.00.
My phone was originally under a DMB2 rom (from Singapore I think). I flashed a DMC3 rom, and used this for five months, until i encountered the problem.
I initially gave up and got a note 3. But i could not believe the phone was junk and people in XDA (as I observed) do not seem to give up.
After two weeks, i found the solution below, which brought my phone to working condition.
1. I flashed the stock rom N7105ZHDMI2_N7105ZZHDMI2_TGY from sammobile.
2. I flashed a pit file using Odin. The pit file is found here:
This restored the baseband. But IMEI was no longer NULL. However, it was still 0.
3. I downloaded and used the EFS Pro from this link:
Before using EFS Pro, make sure you dial *#7284# and change the setting of Qualcomm USB Settings to
"RMNET + DM + MODEM"
I will not hurt your phone if you do, but EFS Pro will just not work. If you don't do this, the EFS Pro will display "Phone not responding" or something similar.
NOTE: I couldn't find the option with RMNET, but i used the option that also had an "RM*** + DM + MODEM".
After the phone is read, change back the IMEI to what it was originally.
Dial *#7284# again to change back to "MTP+ADB".
It's all working now.
Hope this is able to help someone. Now i have two working versions of Note.
Thanks to the authors of the program i used, and the people who uploaded the files used.