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Installing Cyanogen 12.1s ROM in Samsung Galaxy S2 - GTI9100

Hello everyone,
In this tutorial I am going to show you how to Install Cyanogen 12.1s ROM in GTI9100.
This tutorial Includes Rooting your Phone And install Cyanogen in GTI9100

Personally , I just don't like the TouchWiz UI . Its little bit heavy. That's why most android phones gets slow quickly . I just used both Stock Rom (GingerBread) and Custom Rom (Lollipop) for Galaxy S2 , So in my opinion Cyanogen is awesome. It is much faster than the stock Rom.

Actually Cyanogen has stopped their services and moved to Lineage OS . But that doesn't matter . Cyanogen Roms are still out there . The only problem is that you won't get any more official updates from Cyanogen .

This method is also same for CM11, CM12, and CM12.1 custom ROMs, But you need necessary Files.

So its all for Introduction! Let's begin!

Note :  Please Do this at your own risk. I am not responsible if anything goes wrong. I am pretty sure nothing goes wrong , if you do everything correctly. If any problem occurs please let me know. 
Note : you will lose your warranty if you try to root your device

Requirements :

  • Download Samsung USB Drivers And install it in your Pc
  • Make sure that you enabled USB Debugging in your phone, To do this go to Settings > Developers Option > USB Debugging > Tick to Enable. (Developers Option is hidden for Android 4.2.2 or above, to show this option Go to Settings > About Phone > Build Number (Tap on it for 5-8 times))
  • Make a backup of all your files 

    Steps :

    so let's begin..
    1. Download Cyanogen 12.1s for GTI9100 (Copy this zip file to your MemeryCard)
    2. Download Gapps for Lollipo 5.1 (Copy this zip file to your MemeryCard)
    3. Download Odin and install it on your Windows-PC
    4. Download Clock Work Mod Recovery for GTI9100 and move to any folder in your PC
    5. Switch of your phone
    6. Goto Download mode by pressing Volume Down and Button and Home Button and Power Button (You will see a Warning message like this, Ignore and press Volume Up to continue)
    7. Now connect your mobile to your PC with a Data Cable.
    8. Start Odin on your PC (if your mobile is connected you will see something like this)
    9. Then click on the AP button, and select the CWM Recovery file that you downloaded ( It is a .tar file )
    10. Press the start button. Wail till it completes. If it shows like this , this means its done ! (If it shows 'Failed!' , it means you have done something wrong. Try to do it  again.)
    11. Now your phone automatically reboots. It doesn't matter if you are stuck at boot logo.
    12. Disconnect your phone from PC
    13. Make sure that your phone is off, Then Goto CWM Recovery by pressing Volume Up and Home and Power button together. when you see the Samsung logo release the power button. You will see something like this.. 
    14. Use the volume up and volume down buttons to go up and down. Use power button to select a choice.
    15. Select wipe data/factory reset
    16. Select wipe cache partition
    17. Select advanced and wipe dalwik cache too.
    18. When wiping is done, Select Install zip
    19. Select choose zip fro /storage/sdcard1
    20. Select the cyanogen 12.1s zip file that you downloaded. And select yes. Wait till it completes
    21. When its done select The Gapps zip file like you did before. And install that too.
    22. When it is done reboot your Device. First boot takes some time. You will boot into cyanogen 12.1s. If not , Do the above steps again. If you are facing any problems feel free to comment.

    To get Root access :

         Goto Settings > Developers option > Root access > select Apps and ADB

    (Developers Option is hidden for Android 4.2.2 or above, to show this option Go to Settings > About Phone > Build Number (Tap on it for 5-8 times))

    If you are facing any problem with a Yellow Triangle at the boot-up, Try this : Remove Yellow Triangle from Phone!

    Well that's all... i hope this was helpful!

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    This post first appeared on GeekFoxx, please read the originial post: here

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    Installing Cyanogen 12.1s ROM in Samsung Galaxy S2 - GTI9100


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