With the release of Jelly Bean Android 4.1, the CyanogenMod announced their plans to bring CM10 based on Jelly Bean in the near future. While the full functionality such as the customization found on CyanogenMod ROMs will take time to come, CM10 is ready and available for devs to port to different devices in its basic form, which will pave the way to add all functionality to CM10 in the coming days and weeks.

XDA Senior Member DerTeufel1980 has released a Jelly Bean ROM for the Galaxy S, which has quite a lot of stuff working despite being in an early stage. The ROM works quite well and is quite noticeably smoother than Ice Cream Sandwich based ROMs. However, as the ROM is in the early development stage, there are a few things that do not yet work properly, so keep in mind that it may not be usable as a daily ROM.

Here’s a list of things that work/do not work in the ROM as quoted from the developer.

what is working?
- calls/sms
- data
- wifi
. cam
- bluetooth (not tested yet)
- gps

what’s not working?
- mounting of external sd to pc
- market?

NOTE: CM10 is in a very preliminary stage right now, so as already mentioned above, there are no specific customization features of CyanogenMod in CM10 yet, so consider this a purely preview version of CM10.

Read on to find out how you can install Android 4.1 Jelly Bean on your Galaxy S.

Compatibility

This ROM and the guide below are compatible only and only with the Samsung Galaxy S, model number i9000. It’s not compatible the GT-i9003 or with any other device and may render an incompatible device unusable. Check your device model in Settings » About phone.

Warning!

The methods and procedures discussed here are considered risky and you should not attempt anything if you don’t know exactly what you are doing. If any damage occurs to your device, we won’t be held liable.

How to Install Android 4.1 Jelly Bean on Galaxy S i9000

NOTE: If you are already running an Android 4.0 Ice Cream Sandwich ROM on your phone, you DO NOT need to perform steps 3 and 4 below and can skip to step 5 after step 2.

1. This procedure will wipe all your apps, data and settings (but it will NOT touch your SD cards, so don’t worry about those). Backup your Apps and important data — bookmarks, contacts, SMS, APNs (internet settings), etc. This Android backup guide would help you.
   Important! Don’t forget to at least make a backup of your APN settings, which you can restore later if your data connection does not work after installing the ROM. Use the backup guide to find out how.
2. Remove sim card lock, if you have set it earlier. Go here: Settings » Location and Security » Sim card lock » checkbox should be clear (not selected).
3. Flash the stock XXJW4 firmware by using → this guide.
4. Root XXJW4 to obtain Clockworkmod recovery (CWM) by using → this guide.
5. Download the latest version of the ROM from the official development page.
6. Download the Google Apps package. This will install apps like Market, Gmail, etc. which are not present in the ROM.
   Download Gapps  |  Filename: gapps-jb-20120715.zip 
7. Also download the CM10 Fixes.zip file, which is needed in order to make the ROM boot.
   Download Link
8. Copy the zip files downloaded in step 5, 6 and 7 to the internal SD card on the phone.
9. Turn off your Galaxy S and wait for complete shutdown (wait for vibration and check capacitive button lights).
10. Then, boot into CWM recovery. To do so, press and hold the Volume Up + Home buttons while powering on the phone. When the screen turns on, let go of all three buttons. The phone will boot up into ClockworkMod recovery in a few seconds.
    In recovery, use Volume keys to scroll up and down and power key to select an option.
11. Select wipe data/factory reset, then select Yes on next screen to confirm. Wait a while till the data wipe is complete.
12. Then, perform the following steps:
    1. Select install zip from sdcard, then select choose zip from sdcard. Scroll to the ROM file on the sdcard and select it. Confirm installation by selecting Yes – Install _____.zip on the next screen. The ROM will start installing.
    2. After ROM installation is complete, select choose zip from sdcard again, then select the CM10 Fixes.zip file to install the fix package.
    3. After the fix package completes installing, select choose zip from sdcard yet again, then select the gapps-jb-20120715.zip file to install the Google apps package.
13. After installation of the Google apps package is complete, go back to the main recovery menu. Then, select advanced, then select Fix permissions. Then, go back to the main recovery menu and select reboot system now to reboot the phone and boot up into CM10.

CM10, based on Android 4.1 Jelly Bean is now installed and running on your Galaxy S. Visit the official development page for more info and to get the latest updates on the ROM. Share your thoughts on the ROM in the comments.