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Update: Hi guys I have discontinued this thread to the fact that I do no longer own a N7100 device.
Hi Guys,
I thought of creating an official Modem list for the Samsung Galaxy Note II N7100 Modems
I will be adding all the modems available in CWM flashable zips.

What is a modem?
Modem/Radio/Baseband is all the same thing and can be seen by going to Settings - About device - Baseband version. It's basically a driver which receives and sends Mobile Network signals as well as handling switching between GPRS, 3G, HSDPA etc....... (but not WiFi connection, that and switchover between Mobile Network and WiFi is handled by the kernel). Reasoning as to why Modem has no influence on WiFi can be found in this post by Entropy

Why?
Sometimes some custom roms come with modems for various regions. If your modem is designed for different regions than yours then the chances are that it will sometime not work with optimal network performance.

You should look into changing your modem if you are experiencing the following... (I'm writing this from my personal experience, so all may not apply to you).

Poor 3G speeds
Very fast battery drain whilst on 3G
Poor call reception

How to check
Settings >> About device >> Baseband version

Requests
If you want I can make CWM flashable zips, I just need modem donors who will send me modem.bin files with relevant versions so that I could build up this list. You are free to PM me as well.
It is not practical for me to go around downloading all the N7100 roms in the world and extract the modem file.

How to Extract

If you have the N7100 rom zip
1. Extract zip
2. Send me a zip file of the following files modem.bin, optional (/system/lib/libril.so, /system/lib/libsec-ril.so)

From an already installed N7100 (if you do not have the ROM zip with you)
First of all you need to extract a modem if and only if you are in following situations
1. You use a network specific rom and you need to backup the network specific modem and move to a custom rom.
2. Your friend is using a network specific rom and you want to use the same modem.

***[WARNING!]Modems are device dependent

To extract the phone you are extracting must be rooted and usb debugging enabled:
Use adb to dump the modem to your internal phone memory, use this command

Code:
adb shell
su
dd if=/dev/block/mmcblk0p10 of=/sdcard/modem.bin bs=4096
exit
The dumped size will be bigger like 88MB don't worry just zip it and send me the link, I will make a CWM Installer.

---------------------------------------------------------------------------------------------------------------------------------------------

Download Links (CWM Flashable)

Modems With Android 4.3

XXEMI6
XXEMI6

XXEMJ2
XXEMJ2

XXEMJ5
XXEMJ5


Modems With Android 4.1.2

XXALIH
XXALIH

DDALJ1
DDALJ1

UBALJ1
UBALJ1

DXALJ1
DXALJ1

XXDLJ2
XXDLJ2

XXALJ2
XXALJ2

NEDLK1
NEDLK1
NEDLK1-RIL

DXDLK5
DXDLK5

XXDLK7
XXDLK7

XXDMB2
XXDMB2

The following modems are only compatible with 4.1.2 firmware builds ME6 or later and before MI6

XXDME4
XXDME4

DXDMF1
DXDMF1

DDDMG1
DDDMG1

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Thanks
Wanam - for sending me various modems bundled with ROMS
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Tags
baseband, galaxy, modem, n7100, note 2

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