Install Icream Sandwitch in Samsung Galaxy s2 (GT-I9100)

How to Install Android 4.0.3 Ice Cream Sandwich on Samsung Galaxy S2

Firmware I9100XXLPB Android 4.0.3 (Ice Cream Sandwich) for Samsung Galaxy S II I9100
PDA: I9100XXLPB
PHONE: I9100XXLPB
CSC: I9100OXXLP5
Build date: January 29 2012.
Changelist: 99600
Files inside firmware.
I9100_CODE_I9100XXLPB_CL99600_REV02_user_low_ship.tar
GT-I9100-MULTI-CSC-OXXLP5_RST.tar
MODEM_I9100XXLPB_REV_02_CL1101286.tar
How to flash.
- Open ODIN. In Odin, click on below mentioned respective tabs and select the corresponding files as mentioned below.
PDA: I9100_CODE_I9100XXLPB_CL99600_REV02_user_low_ship.tar
Phone: MODEM_I9100XXLPB_REV_02_CL1101286.tar
CSC: GT-I9100-MULTI-CSC-OXXLP5_RST.tar
Changes. (Only more stable in case of LP6)
Interface: Kind of 3D effect when scrolling.
Battery: More stable.
Faster: More stable.
Touch: More stable.
Overall: More stable.
Facelock: More stable.
Task: More stable.

For downloading the required file you need to register to the linked site which is totally free n easy to use. 

• ODIN + PIT + Flashguide |Download
• I9100XXLPB|4.0.3|2012 January|CSC – OXX|Download

• Password: samfirmware.com