Install Sammy Bean JB ROM AT&T for Samsung Galaxy S2 I777 (Android 4.1.2 Custom ROM)

Update Samsung Galaxy S2 I777 AT&T with Sammy Bean JB Custom ROM

The AT&T Samsung Galaxy S2 has received a new custom ROM and you can use this tutorial to learn how to flash it. It’s an Android 4.1.2 custom ROM and it has been released on XDA forums with the Sammy Bean ROM title. Use all the info that I’ve listed in this post and you’ll successfully manage to install the ROM on your smartphone.

Sammy Bean JB custom ROM has been launched by ‘estabien’, an XDA member and developer. It features Jeboo Kernel, Ripple Lock, improved reboot selection menu, Sony Bravis and Xloud engines. There are some other new features and you will find more info by visiting the ROM’s XDA thread. It is a pretty stable OS and you should read the preparation guide below before starting to install it on your smartphone.

Here’s what you need to know before getting to the installation part of this article. Make sure that you read all the guidelines below, so that you won’t lose important files during the update process:

  • This is a post that works only with the AT&T variant of Samsung Galaxy S2 model number I777. Do not attempt to flash this new firmware on any other smartphone as you will end up bricking it. No other SGS2 supports this version of Sammy Bean JB ROM.
  • Your device has to be rooted and running CWM Recovery. Without these you cannot complete the installation.
  • You need to use the ClockworkMod Recovery and create a full NANDROID backup of the ROM that your phone currently runs on. This file will prove to be very useful in case you cannot boot your device into normal mode with the new ROM. NOTE: If the new ROM doesn’t boot then you can enter CWM Recovery mode and then use the ‘backup and restore’ option to restore the current OS backup file.
  • The tutorial will ask you to wipe data and factory reset your phone, which means that you can use the following tools to save a list of installed applications or to backup SMS, Call Logs and the APN Internet Settings: SMS backup & restore | Call Logs backup & restore | APN Settings Backup & Restore | AppBack for Android application. Root access is needed for some of these applications.
  • Sync your Contacts with the Gmail account you’ve assigned to your smartphone. This will prevent you from losing any important phone numbers after installing the new Sammy Bean JB build ROM.
  • Remember to charge your phone’s battery so that it won’t power off while you’re installing the new Android 4.1.2 custom OS.
  • This is a guide for advanced Android users and you should be careful while installing the files as you wouldn’t want to brick your phone. Note that we cannot be blamed if you lose data or your device refuses to boot after installing Sammy Bean ROM.
  • Read the entire how-to guide and make sure that you don’t skip any of the steps I’ve listed, as that will result in a failed attempt of ROM installation.

Now that you know all of the above I think that you can move to the tutorial. If you have problems with completing installation then you should ask for more help in comments.

How to install Sammy Bean JB on your Samsung Galaxy S2 I777 AT&T:

  1. Download the custom Jelly Bean 4.1.2 ROM zip from HERE. Save the file on your PC desktop screen and don’t unzip its contents.
  2. Connect your smartphone to your PC and then copy the ROM on to its internal SDcard. Disconnect the phone when the zip is copied.
  3. Power off your smartphone and then boot it into CWM Recovery mode. It can be done by pressing and holding at the same time Volume Up, Volume Down and Power. Release the buttons only when you’re at the main custom recovery screen.
  4. You can choose to create now a Nandroid backup of your current ROM by using the ‘backup and restore’ option. If you already have a backup file then you should skip this step.
  5. Select ‘wipe data/ factory reset’ option and confirm this process.
  6. Next, select ‘install zip from SDcard’ and then ‘choose zip from sdcard’. Find the Sammy Bean custom ROM zip file and confirm that you want to install it.
  7. When the ROM installs you should return to the main recovery menu. Select ‘reboot system now’.
  8. Now your phone should restart and it will boot into normal mode. This first boot process with the new ROM shouldn’t take more than 5 minutes to complete.
  9. Enter your Google Account details and then begin testing the new ROM.

NOTE: If the custom ROM doesn’t boot after 5 minutes have passed then you should power off the device. Then you should repeat the entire tutorial starting with step 3. Eventually you should be able to flash the ROM at the second attempt.