AT&T Galaxy S2 i777 is yet to receive official Android 4.1 Jelly Bean update.XDA Recognized Developer Faryaab has developed SuperNexus ROM to provide the experience of Jelly Bean found in Nexus device to other devices and is built from Google’s AOSP Source.
From developer’s page –
Rooted (Super SU)
No 3rd Party App
Official Jelly Bean Bootanimation (From Official Nexus S Android 4.1.1 Factory Image)
Bash & Nano Support
Native SIP/VOIP Support
EXT4 File System Optimizations
Boot Animation Performance Enhancements
Galaxy S II Device Settings as an App
Extended Power Menu (Reboot, Recovery & Download Options)
Powerkey Camera Shutter (Click Power Button To Capture Image/Video in Camera App)
Device Hardware Information (Settings>About Device>Hardware Information)
T9 Dialer Functionality (Smart Dialer)
Landscape Dialer Support
Increased Tab Limit in Stock Browser From 16 To 64
Huge APN & SPN List
Tweaked Progress Spinners Values (Silky Smooth Loading Spinners)
Allowed Any File-Type To Be Downloaded
Allowed Installation Of Apps From Unknown Sources By Default
Disabled Data Roaming By Default
Improved Scrolling Cache
Reduced Boot Time
Not butter smooth but still nice
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The guide will work only on AT&T Galaxy S2 Model No.i777 and cannot be tried on other devices.To know the Model No.of device Go to Settings >> About.
We cannot be held liable if your device gets damaged while following the below mentioned guide.Go through the instructions carefully.
Install SuperNexus ROM On AT&T Galaxy S2 i777
Before you go ahead with the instructions take a complete backup of data,apps and settings as the procedure may wipe data.
Enable USB debugging on device.“Settings” >> “Developer settings” >> Enable “USB debugging” option.
ClockworkMod recovery should be installed on your device.
Battery of your device should be charged to minimum of 50%.
Download latest version of ROM from here.
Download Google Apps package from here.
Copy both the above downloaded files to internal SD card of device without extracting.
Turn off device and then boot into CWM recovery.Press and hold down the Volume Up, Volume Down and Power buttons.
Take a Nandrop backup of ROM which you are using currently.Select “Backup and Restore” >> On the next screen >> “select Backup again”.Go back to main Recovery Menu once backup is finished.
“Wipe data/factory reset” and then confirm to wipe.Wait till the data gets wiped.
Select “install zip from sdcard” and then select select “zip from sdcard” and navigate to the ROM file which you have downloaded and select it to install.The ROM will start installing.
After ROM installation is done,select “choose zip from sdcard” and then select gapps-jb-20120726-signed.zip file to install the Google apps package.
Once Google Apps package installation is done, “Go back” and select “reboot system now” to reboot device.
SuperNexus ROM is successfully installed on your AT&T Galaxy S2 i777!