CyanogenMod is the most popular aftermarket custom firmware (AKA custom ROM) on Android for one very important reason: it receives constant support from the community, enabling owners of old smartphones to try out the latest versions of Android and allowing owners of the latest smartphones to ditch their smartphone manufacturer’s custom skin for a more vanilla Android experience.

Now – with the release of Android 4.1 Jelly Bean and the resulting announcement of CyanogenMod 10 – the developers have released the first experimental build of CyanogenMod 10. It is full of major broken features, has laggy UI and, as such is unsuitable for daily use.

Still, those of you willing to try it out can follow our step by step guide after the jump.

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DISCLAIMER: You will void your warranty after rooting your device. Redmond Pie will not be held responsible for any damage incurred to your device as a result of following this guide. Follow at your own risk.

Step 1: Root your Galaxy S III by following one of the following methods based on which variant you are using: International Version GT-i9300, AT&T / T-Mobile / Sprint. Be sure to flash ClockworkMod Recovery if you haven’t already.

Step 2: Download CyanogenMod 10 for your Galaxy S III variant: International Version, AT&T, T-Mobile, Sprint [Official Forum Threads]. Place the .zip file directly under /sdcard directory on your S III for easy flashing in Step 5.

Step 2: Shut down your Galaxy S III. Press and hold Volume Up, Home and Power buttons until you boot into ClockworkMod Recovery.

Step 3: Take a NANDroid backup.

Step 4: Navigate to install zip from sdcard > choose zip from sdcard > [file you transferred to your Galaxy S III in Step 2].

WARNING! All your personal data will be deleted in this step. This is a safety requirement for whenever you flash a new ROM.

From the main menu, select wipe data / factory reset.

Step 5: From the main menu, choose reboot system now.

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If you followed the steps correctly, your Galaxy S III will now boot into CyanogenMod 10 which is based on Android 4.1 Jelly Bean. For queries, suggestions and complaints, please visit the respective official threads linked to in Step 2.

Like we mentioned before, this ROM is not stable for daily use, therefore proceed with caution.

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