[Galaxy S II General] codeworkx:
CyanogenMod is a free, community built, aftermarket firmware distribution of Android 4.0 (ICS), which is designed to increase performance and reliability over stock Android for your device.

#include
/*
* Your warranty is now void.
*
* I am not responsible for bricked devices, dead SD cards,
* thermonuclear war, or you getting fired because the alarm app failed. Please
* do some research if you have any concerns about features included in this ROM
* before flashing it! YOU are choosing to make these modifications, and if
* you point the finger at me for messing up your device, I will laugh at you.
*
* Submitting bug reports on nightly builds is the leading
* cause of male impotence.
*/

CyanogenMod is based on the Android Open Source Project with extra contributions from many people within the Android community. It can be used without any need to have any Google application installed. Linked below is a package that has come from another Android project that restore the Google parts. CyanogenMod does still include various hardware-specific code, which is also slowly being open-sourced anyway.

All the source code for CyanogenMod is available in the CyanogenMod Github repo. And if you would like to contribute to CyanogenMod, please visit out Gerrit Code Review. You can also view the Changelog for a full list of changes & features.

http://teamhacksung.org/wiki/index.php/CyanogenMod9:GT-I9100:Nightly:Known_issues

http://teamhacksung.org/wiki/index.php/Experimental:GT-I9100:Frequently_Asked_Questions

If you're a bloody noob and getting confused by following simple instructions, go down and read about using the noob-proof ODIN method.

First time installing CyanogenMod 9 to your Galaxy S II, or coming from another ROM:

- READ FAQs: http://teamhacksung.org/wiki/index.php/Experimental:GT-I9100:Frequently_Asked_Questions

- Make sure you're running ICS bootloaders lower than LPH! (if you're unsure, flash the CM9 Resurrection Edition)

- Make sure you're running a proper working ClockworkMod-Recovery

- Copy GApps and CM9 ZIPs to your internal SDCard

- Boot into Recovery

- Flash CM9 zip

- Flash GApps zip

- DO A DATA WIPE / FACTORY RESET (otherwise your calendar sync will not work)

- Reboot

- Don't restore Apps using Titanium Backup!

Upgrading from earlier version of CyanogenMod 9:

- Copy CM9 ZIP to your internal SDCard

- Boot into Recovery

- Flash CM9 zip

- Reboot

Using the noob-proof ODIN method:

- Download CM9 Resurrection Edition

- Download GApps and put it onto your internal sdcard

- Open Odin

- Choose cm-9-XXXXXXXX-ODIN-galaxys2.tar.md5 as PDA

- Boot your phone into download mode

- Connect your device via usb to your computer

- Wait till Odin has fully recognized your phone

- Hit the start button and wait till the flash process is finished

- Device boots automatically into recovery

- Flash GApps

- Reboot into CM9

- Follow above steps to update CM9 to lastest available version (Upgrading from earlier version of CyanogenMod 9)

STOP!!!

Did you read THIS POST fully, the FAQs and KNOWN ISSUES?

Nightly builds:

http://download.cyanogenmod.com/?device=galaxys2

can also be found at ROM-Manager

Google Apps:

Get the latest Version from Rom-Manager. We recommend to use 20120317.

Newer, unsupported versions can be found at http://goo.im/gapps

CM9 Resurrection Edition for use with Odin:

20120420: Download

20120330: Download

CWM flashable Modems:

LPX Modem: Download

LPW Modem: Download

LPS Modem: Download

LPR Modem: Download

Have a look at ROM-Manager (Developer: codeworkx) for more Modems.

http://changelog.bbqdroid.org/#galaxys2/cm9/next

Webchat: http://webchat.freenode.net/?channels=teamhacksung-support

Server: chat.freenode.net

Channel: #teamhacksung-support

Don't expect any support if you:

- are not running stock cm-kernel

- have installed any mods

- have modified system files

If you're going to reuse our work, which we're doing for free, be fair and give proper credits.

This is the only payment we're really demanding and we deserve it to be mentioned because of the countless hours we've put into this project.

Open-Source doesn't meant Out-of-Respect!!!

Thread for Developers only!!!

http://xdaforums.com/showthread.php?p=20671183

AdamG-, atinm, codeworkx, coolya, guiper, nebkat, Unhelpful, xplodwild, teamhacksung, the cyanogenmod-team.

If you want to donate a few bucks for the work we're doing, goto teamhacksung website and hit the big donate button.

Thanks to all donators!