Personally, I don’t install custom modem on my Samsung Galaxy S II. Usually, I will stick with the modem that comes along with the firmware. However, you might love that particular firmware but wish to upgrade the modem only. So you have to install official custom modem on your Samsung Galaxy S2 manually. What is the benefit of using custom modem? Well, one modem version does not work well for all the region’s telco. So there are several versions. Some modem might have better signal, speed, reception and coverage and some don’t. Choosing the correct one take time. You need to benchmark the 3G speed, battery consumption, signal strength… Monitor its performance for days. So I don’t change modem much unless I found it really bad (which I did not see one yet).

How to install custom modem on Samsung Galaxy S2?
There are several ways to install custom modem on Samsung Galaxy S2 ~ Odin, CWM and kitchen (on custom ROM like CheckROM).
Use Odin to install modem tar (or tar.md5) file. Just like the way to install CF-Root kernel except you put the modem file at PHONE instead of PDA in Odin.
If the modem is in CWM zip flash-able format, ClockworkMod Recovery is the tool that will help you to install the custom modem. Refer How to install update zip with ClockworkMod Recovery on Samsung Galaxy S2? (Video) guide to more information.
Finally, the easiest way ~ using KitchenPro App in CheckROM. Just mark the modem that you want for installation. Then Apply it to install. That’s all.
Download official Samsung Galaxy S2 modem here.
What is custom modem..and wht r its uses??
Read the post…
what is the latest stock modem for malaysia?
DXKI1
Hi jayce
i Looking for kernel xxki4
Can u help me?
https://www.jayceooi.com/2011/08/04/download-official-samsung-galaxy-s2-firmware/
my baseband version is xxki4
how i can change my baseband version to xwkk5?
Do we have XWKK5 baseband?
have we?
I have not see it yet.
I have a i9100T Samsung Galaxy. can someone tell me where I can download DUKJ1 modem for this australian phone.
XDA website link in the post.
Hi Jayce,
my phone baseband version is I9100GDXLP6. Can i change my baseband version with I9100GXXLPY.
thanks
Changing modem is okay. But I have no idea on I9100G.
When I update my phone firmware was some interruption on computer and update not completed fully. After that when i switch on my phone it show SOFTWARE UPDATE FAIL. Tried it update again but Download MODE (Home + Volume Down + Power) is not working.
pls help if anyone face this problem.
thanks
Hi Juma, you can’t do much if failed to load Odin download mode. Unless you have CWM installed. Then you can use CWM to install new ROM.
Hi Jayce,
Thanks for replay
Now i cant do nothing coz Download and recovery MODE (Home + Volume down/up + Power) are not working. Screen show SOFTWARE UPDATE FAIL when i switched on. Any idea/option!!!!
Hi Juma, you can try to use Samsung Kies. See can restore it or not. If no, please consult Samsung Support then.
Hi Jayce,
I have the SGS2 very weak to almost no signal. im in north america with 4.03 band I9100MUGLD3 what modem would you suggest i try to improve signal strength?
thanks,
Cleo
Hi Cleo, you need to try them yourself to find out.
dear, what is for Iran – Middle east.
thanks
Sorry sasa, I have no idea too. But you can try other region if you want.