Update Nexus S I9020 to Android 4.2.1 JellyShot Jelly Bean Custom ROM
Google has dropped support for the Nexus S I9020 with their latest Android 4.2 Jelly Bean release. Well, that doesn’t mean you still can’t enjoy Android 4.2.1 on your Nexus S I9020. You can now install Android 4.2.1 JellyShot Jelly Bean on Nexus S I9020. Remember, this is a custom firmware with tons of more features on top of stock AOSP Android 4.2.1 Jelly Bean. This is not an official firmware. You will need a custom recovery installed on your phone in order to install CM10.
In this tutorial, we will tell you how to update Nexus S I9020 to Android 4.2.1 JellyShot Jelly Bean custom ROM with complete steps and instructions on how to backup your phone apps and personal data. We also have some more important tips that you have to keep in mind before proceeding to the tutorial on the next page. Your Nexus S should be rooted and ClockworkMod recovery should be installed. Let’s get on with the tutorial now and flash a new custom ROM on the phone.
Disclaimer: All the custom ROMs and firmwares, official software updates, tools, mods or anything mentioned in the tutorial belong to their respective owners/developers. We (TeamAndroid.com) or the developers are not to be held responsible if you damage or brick your device. We don’t have you on gun point to try out this tutorial 
Android 4.2.1 JellyShot Jelly Bean Firmware Details:
This is Android 4.2.1 Jelly Bean custom ROM for the Samsung Nexus S I9020. This is an unofficial firmware, so might come across some bugs and issues. Don’t forget to report back to the developer so those bugs can be fixed.
Samsung Nexus S USB Drivers
You will need to connect your Android phone with the computer. For that, please make sure you have installed the USB drivers for Samsung Nexus S properly. If not, you can download the latest official drivers from our Android USB Drivers section here:
Download Samsung Nexus S USB drivers!
Backup and Other Important Tips
Done with the USB drivers? Perfect. The tutorial is on the next page, but first, please take a look at the following tips and important points you need to take care of. These are important, as we don’t want anyone losing their personal data or apps:
Always backup your important data that you might need after you install a new custom ROM, an official software update or anything else. Make a backup for just in case, you never know when anything might go wrong. See below for some tips on how to backup data:
- Backup your Apps. How? –> How to Backup Android Apps.
- Backup your SMS messages. How? –> How to Backup/Restore SMS Messages.
- Backup Contacts, Gmail and Google Data. How? –> Sync with Google Sync.
- Backup Call History. How? –> How to Backup Call History.
- Backup WhatsApp Messages. How? –> How to Backup/Restore WhatsApp Messages.
- Backup APN Settings: GPRS, 3G, MMS Settings. How? Note down everything from: Settings > Wireless & Networks (More…) > Mobile networks > Access Point Names.
Samsung users can also back up data using Samsung KIES. If you backup data manually, you get more options what to choose from and it is very easy to move data across Android devices from different manufacturers, i.e moving Samsung Galaxy Note backup data to HTC One X.
If you already have a custom recovery (ClockworkMod, TWRP etc.) installed on your phone, we strongly recommend a backup using that as it creates a complete image of your existing phone set up.
A few more optional tips that you should remember:
1. Having problems connecting your Android phone to the computer? You need to enable USB debugging mode. See here: How to Enable USB Debugging — for Gingerbread, Ice Cream Sandwich and Jelly Bean.
2. Make sure your Android device is charged up to 80-85% battery level. This might help you: How to Check Battery Percentage. Why? Because, if your phone goes off suddenly while installing a custom ROM, flashing an official firmware update or installing mods etc. — your phone might get bricked or go dead permanently. No one wants that, right?
4. Most of the tutorials and how-to guides on Team Android are for factory unlocked Android phones and tablets. We recommend NOT to try our guides if your phone is locked to a carrier, unless we have specified the carrier name or device model.
If you find the above tips useful and they were helpful to you, please consider giving us a +1 or LIKE to thank us!
All set and ready? Good. Now, let’s proceed with the tutorial on the next page and update Nexus S I9020 to Android 4.2.1 JellyShot Jelly Bean custom ROM.
