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So I have Samsung Galaxy SII Plus(Gt-I9105P)
It has Stock android 4.1.2.(rooted).
I wanted to flash Cynogen Mode 11 M12
To do that, they say that i need to flash boot loader 4.2.2.
link
What is it? I installed CWM when I rooted. Is that enough? Should I install Android 4.2.2. before I install CM?

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When you start your phone up you probably see a Samsung logo and an android logo... Basically, The system that opens this up is called the boot loader and you need to unlock it to gain root access... This allows you to edit system files.

See http://www.all-things-android.com/content/understanding-android-file-hierarchy

It will help you understand what exactly root is. CM needs to unlock your bootloader because it needs to modify android files at the core of your phone.

Hope this helps, Rahul

  • Thx @rahul. Got the general idea. So, should i install 4.2.2 before i install 4.4.4? Does boot loader comes with os(android)? Should i install the boot loader alone? – Jacob Thazhath Feb 8 '15 at 20:32
  • No bootloader and OS are completely different things and should have no problem in skipping any version if you want and your device support it – Freedo Feb 9 '15 at 3:09
  • @freedom, so what should I do to update to KK? – Jacob Thazhath Feb 9 '15 at 6:11
  • Flash their bootloader if that's necessary then flash the 4.4 system image for your device that you should have...if you don't know how to flash then go to xda you'll probably use odin for that – Freedo Feb 9 '15 at 6:17
  • @freedom,got it... So i need to flah the bootloader(only boot loader) and then 4.4 .. Thx – Jacob Thazhath Feb 9 '15 at 11:21

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