Tutorial To Install Jelly Bean 4.1.1 - Manual Installation

Before Starting or Giving up the Tutorial To install Jelly Bean 4.1.1 Manually , i request you to check The OTA Update ( Force Check In ) . 

Features : 

•  OTA update Wont Delete Any Data , Instead It Overwrites the Application installed inside in your phone.

If the OTA doesnt Work For your Device , Here is the Tutorial to install manually . So Whats the Requirements to install Jelly Bean 4.1.1 on Galaxy Nexus

Requirement :

•  Follow This Link And Download the Files Attached (ALL)

NOTE :

• I request Those Who Follow Manual Install on Your Device , Kindly Make A Full Backup of your Phone ( To Restore )
• The Steps,Links Provided Here are Collected From Xda Developer Site , Am Not Responsible For Any Damage Done To your Device

Steps : 

1.  If you are on any 4.0.x ROM, it is highly suggested you do a full factory reset (wipe data/cache in   recovery) prior to flashing Jellybean! 
2.  If you are upgrading from a JB ROM (4.1), please just wipe cache and dalvik cache.

• Wipe accordingly as outlined above
• Use your recovery to flash the ROM file
• Do NOT flash any gapps - they are all included
• Optionally, flash the baseband (radio) update if you'd like the newest one
• Reboot - be patient, the initial boot may take a few minutes

For Detailed Instructions :

1.  Download latest ROM [ includes SuperSU & gapps]
2.  Download the baseband/Radio [optional] 
3.  Install GetRIL of Market [optional] (PlayStore)
4.  MAKE A BACK-UP , either with clockwork or team win recovery (remember cwm restores cwm and twr restores twr backups) [ MANDATORY]

Baseband Installation  (optional) :

1.  Boot into recovery
2.  Wipe Dalvik / Cache
3.  Flash the new baseband
4.  Boot into System
5.  Open GetRIL and let it do its magic, by installing the matching RIL
6.  Smile Baseband and RIL are up-to-date

Ready for 4.1.x installation ( JELLY BEAN ):

1.  Boot into recovery
2.  Wipe everything (except your SD-Card/Storage of course)
3.  Flash the 4.1.x ROM (ga pps & superSU are included)
4.  Boot up your phone
5.  SetUp everything
6.  Now to be safe, make sure recovery is installed, this is rather optional, but better safe then sorry. Takes less than a minute.
7. THATS IT 

Replace superuser with supersu and vice versa:

• you need to remove the superuser/supersu.apk from system/app
• Then boot straight into recovery
• wipe dalvik/cache
• flash supersu.zip or superuser.zip 
• reboot
• open app to update binaries

Credits and Source From Xda Site 

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