XXALF2 is the recent Android 4.0.4 ICS firmware for the Samsung flagship Galaxy SIII GT-I9300, aka SGS3, released in UK which solve the well known home button lag problem, as well as better standby battery usage


firmware details:
build date: 2012-06-05
pda: XXALF2
modem: XXLF2
csc: OXALF2


build info:
ro.build.display.id=IMM76D.I9300XXALF2
ro.build.version.incremental=I9300XXALF2
ro.build.version.sdk=15
ro.build.version.codename=REL
ro.build.version.release=4.0.4
ro.build.date=Tue Jun 5 04:19:31 KST 2012
ro.build.date.utc=1338837571
ro.product.model=GT-I9300
ro.product.brand=samsung
ro.product.name=m0xx
ro.product.device=m0
ro.build.PDA=I9300XXALF2
ro.build.hidden_ver=I9300XXALF2
ro.build.changelist=671647


download link:
link 1