Install Android 5 Lollipop on Samsung i9100 SGS2

Install Android 5 Lollipop on Samsung i9100 SGS2. I’m currently using Cyanogenmod 12 by Lysergic ..


It works well, the only thing not working yet is HD video recording so if you are super into that, you should wait. I’m currently using Cyanogenmod 12 by Lysergic and the most important things for me are working gps and that it’s fast. Gps works fine. It can be a bit sluggish at times but I’m okay with it, but I would recommend that you use something like clean master to keep apps from starting automatically at boot.
The install is easy. Here are the steps:

1. Root
Make sure you’re phone is rooted. If not, follow step 1 here

2. Download “Rom”.zip and Gapps to your phone
There are to date already a few roms out there. I would currently recommend either:
Cyanogenmod beta by Lysergic or
Resurrection Remix
I usually go with the Nano-Package Gapps from Paranoid Android here but I also suggest that you check the recommended Gapps package according to the author of the rom you choose.

3. Kitkat compatible recovery
Make sure you have a kitkat compatible recovery. If not follow step 3 here

4. Factory reset (*recommended)
Boot up in recovery (hold Vol-Up + Menu + Power simultaneously)
Select wipe data/factory reset. But make sure you have all your files you don’t want to loose, backed up. This WILL erase most files on your phone if not all.
*you should. If you already have an aosp based rom with android 4.4.x installed it can work anyway but I would highly recommend a factory reset to minimize the risk of issues.

5. Install Rom
Select Install zip and choose your “” file first. and chose Yes. After you have done this, install the Gapps file you downloaded as well.

disclaimer: if something broke, it’s your fault.

Root and install Kitkat on Samsung Galaxy s2 i9100 – without a computer

Root sgs2 and Install Kitkat Rom without even touching the computer.


If you own a Samsung Galaxy S2 GT-I9100 and haven’t already rooted it. First of all, wow, you really are patient. But by now, you have probably guessed that Samsung has deserted you and won’t bring any more updates to your phone. I like my phone a lot and the hardware still competes with new phones so there’s no reason to buy a new phone yet! Bring out the enviromentalist in you and keep your electronics a little longer!

1. Root
2. Download all files to your phone
3. Install Recovery
4. Factory erase phone
5. Install your flavor of Kitkat Rom.
1. Root – Framaroot
You’re going to need the “one click root” app framaroot. Scroll down and download the latest version or better yet, install framaroot from Google Play store. Just make sure your device is on the list of compatible devices.

It’s now ridiculously easy thanks to framaroot. Open framaroot on your phone and choose that you want to root your phone and  Install SuperSU as the action after root. There are at the time of writing, three modes available. Try them until you find one that works. For me Aragorn worked every time. If it doesn’t work, you won’t be able to continue with the next steps. Try my old manual on how to root sgs2. It should still be relatively accurate.

Alright, let’s say you’re Rooted, reboot your phone and go on to the next step.

2. Download all files to your phone

Install Rom Manager from Google play
Rom manager

Download CWM Recovery (Kitkat Compatible)

Download your flavor of Kitkat Rom and Gapps.
I have tried a multitude of different roms out there and as of now my favorite is Resurrection Remix. 3 main reasons. It’s stable, Gps works well MMS works well.
If you want this rom, head over here Resurrection Remix – XDA. Scroll down to the download section and download the latest versions available. Make sure you have both the Rom and Gapps (I use the light version of gapps. You can install the other apps from Play if there’s something your missing anyway)

3. Install Recovery
First you need to install just a normal recovery. I usually do it through Rom Manager.
open rom manager which you have already installed. And click Flash ClockworkMod Recovery. If it doesn’t choose phone version for you, choose galaxys2. I never choose i9100. I’m not sure why there are two versions but galaxys2 always works for me.

When you are done, turn your phone of. Start it up by simultaneously holding the vol-up, menu and power button. You should see a cute android spinning with things in his stomach and then you should find yourself in recovery mode.

Navigate with vol-up and vol-down and select with the power button. Choose Install zip.
> Choose zip from /storage/sdcard0 (or whatever option you have where you can find  your downloads)
Select your and choose Yes. After you’re done. Turn your phone of and start it into recovery mode again like you did earlier.

4. Factory reset
Select wipe data/factory reset. Make sure you have all your files you don’t want to loose, backed up. This WILL erase most files on your phone if not all.

5. Install Kitkat Rom
Now you’re ready to install your rom. Select Install zip and choose your “” file first. and chose Yes. After you have done this, install the Gapps file you downloaded as well.

Now reboot your phone and you should be done!

Downloads in case you’re confused.
1.  framaroot from Google Play store
2. Rom manager
3. CWM-Recovery-Kitkat-Compatible-i9100
4.  Resurrection Remix – XDA and Gapps.

IMPORTANT – Only if you get a signature verification issue
If you get issues with signature verification regarding CWM recovery. Please make sure you check the MD5 Sum of the file so that it hasn’t been corrupted during download. Here’s how to do it.

Download MD5 Sum Checker >here<
And compare to this MD5.

If you want to check the MD5 sum on your computer it fairly simple. For windows there are applications that will do it for you. In Linux or on a Mac you just open a terminal, go to where you have your file and type


press enter and the md5 sum will be displayed.

disclaimer: I’m not responsible for anything ever.

How to root Samsung Galaxy s2 (i9100)

1. Check your ROM version
2. Download the appropriate CF-Root for your ROM
3. “Flash” the kernel with Odin

There are a couple of different options but I’ll only explain one. Before you start. There is a possibility of loosing the guaranty on you phone, and also, if you break anything it’s not my fault. This is only an explanation of how I did it.

What you need. Your phone, a windows PC and a usb cable to your phone.

1. Check the version of your ROM (Firmware version)
On you phone go to menu->settings->about phone, scroll to the bottom. You will notice that your ROM has a long name that looks something like this x.x.x-xxxXWKF3-xxxxxx. The last 5 digits in the “middle” part of the name shows the name of your ROM.

2. Dowload the appropriate CF-Rooted kernel for your ROM
Now that you know the version of your ROM, you can go to the next step. A developer called Chainfire has been kind enough to set up prerooted kernels with all the tools you need to get the best use of your rooted phone

Check the following link, CF-Root press ctrl+f (cmd+f if you’re on a mac) and search for the last 3 digits in the name of your ROM which in this case will be KF3. Double check the name to see if it’s correct and then download the kernel

3. “Flash” the kernel with Odin3 v 1.83
Download Odin, you can find it with an easy google search.
Extract the file and open the program.

Power off your phone and power it on by holding the following 3 buttons simultaneously.
Volume-Down + Home (middle button) + Powerbutton. If you did it right you should find your self on a screen with the title ODIN MODE and the option of restarting or continue. Press Volume-Up to continue.
Now connect the USB-Cable to your phone. Windows should now try to install the drivers for you phone, just let it finnish. If the driver install fails you should check Samsungs support pages for the drivers to your phone. If it works, Odin should look like this:

Now click the PDA button and point it to the CF-Rooted kernel you downloaded. Make sure Repartition and Phone Bootloader are not checked (if you don’t know what your are doing). Now click Start and wait until you see this screen

Your phone should restart by itself. When it’s up and running again, check your applications menu and see if you have a new app called CWM. If you do, you are good to goo. Happy rooting!