How to Install Android 4.2.1 Jelly Bean on Samsung Galaxy Tab 8.9 P7310 with CM10.1 ROM

1. Connect your Samsung Galaxy Tab 8.9 P7310 to the computer with the original USB cable.

2. Copy downloaded ROM zip file to the root folder on your tablet. Important: Do not extract any file.

3. Disconnect the USB cable from computer and then power off your tablet.

4. Boot into Recovery mode. To do so, press and hold Power and Volume Up buttons together until Samsung Galaxy Tab 8.9 logo appears on screen. When you see the logo, release the Power button but continue holding Volume Up button for a few more seconds until the device boots into CWM Recovery screen. NOTE: Use Volume keys to navigate and Power button to select an option in Recovery.

5. Take a Nandroid backup of your current ROM so that you can restore it later if something goes wrong with the new ROM. To do a backup, choose Backup and Restore and then hit Backup on next screen. Return to main recovery menu once backup is done.

6. Perform a full data wipe. To do so, click wipe data/factory reset and then hit Yes on next screen to confirm. Wait for a few minutes until the data wipe process completes.

7. Choose Install zip from sdcard and click Choose zip from sdcard. Now, locate the CM10.1 ROM zip file that you copied to your tablet earlier in Step 2 and select it by tapping Power button. Confirm ROM installation by tapping Yes to confirm and the installation will begin.

8. After the ROM is installed, repeat step 7 but choose GApps file instead of ROM zip to install the Google apps package.

9. Perform a full data wipe again. To do so, hit wipe data/factory reset and click Yes on next screen to confirm. Wait for a few minutes until the data wipe process completes.

10. Once the data wiping process is done, return to the main recovery menu and tap Reboot System Now to reboot the tablet into customized Android 4.2.1 CM10.1 ROM. The first boot may be time-consuming (takes about 5 minutes). So, leave it alone.

Android 4.2.1 Jelly Bean based CM10.1 ROM is now installed and running on your Samsung Galaxy Tab 8.9 P7310.

[Source: Android Jinn]