How to Flash RootBOX Jelly Bean 4.1.1 on GT-i9100G

Features

• AOKP Based ICS 4.0.4 IMM76I (Built from Source - RootBox Sources)
• CM9 based ICS Kernel
• Horse Power Kernel
• Launchers: Nova Launcher, Apex Launcher, LG Launcher (240DPI +SGS3 Theme), TouchWiz UX Launcher (180DPI and 240DPI)
• File Manager: ES File Explorer, Solid Explorer
• Music Player: Google Play Music, Sony Walkman Music Player, Apollo Music Player
• Music Enhancement: Beats Audio & DSP Manager
• Camera: AOKP + cherry picked CM9 features (ISO support & Burst Shots)
• Unread Notification Count for Missed Calls and Messaging (LG Home Launcher)
• Multi Waves Lockscreen (Multi Waves Style + 2-8 Target Apps)
• Tweaked build.prop (Phone, Battery, WiFi, GUI & Network tweaks)
• Modified host file (Block ads)
• CM9 Messaging App (With break line, Enter or Smileys)
• CM9 Browser
• Sense 4 Task Manager
• Lockscreen Vibration Option
• Default or Dark Theme Google Apps
• ICS or Jelly Bean Animations
• OTA Update (Rom, Kernel and Apps)
• Init.d Fix applied

Bugs

• AOKP/CM9 BUGS
• Only 240 DPI for LG Launcher
• Nav Bar Not Compatible With LG Launcher

Installation Steps

IMPORTANT!.You need ICS bootloader or the rom wont boot.
[How to fash ICS?]

Coming from another Custom ROM:

1. Wipe Data/Factory Reset (This does not affect your Internal/External storage)
2. Format /System (This does not affect your Internal/External storage)
3. Flash ROM
4. Follow Aroma Instructions (Uncheck Reboot Device when Aroma Installation is complete)
5. Wipe Cache
6. Wipe Dalvik Cache
7. Reboot

Coming from Stock Samsung ROM:

1. Root Phone - Get CWM Recovery
2. Wipe Data/Factory Reset (This does not affect your Internal/External storage)
3. Format /System (This does not affect your Internal/External storage)
4. Flash ROM
5. Follow Aroma Instructions (Uncheck Reboot Device when Aroma Installation is complete)
6. Wipe Cache
7. Wipe Dalvik Cache
8. Reboot

Download Link

Link 1
Link 2