Sorry for my first upload, i've forgot to select recovery archive.
Now your smarphone Galaxy S Plus finally fully supports Android ICS v4
Transform your phone in an last developed Android version
Installation will be quick and easy (4 to 6 minutes)
Battery's life will be up to 18% better than older 2.3.6 Ginger
RAM Memory is improved for best performance for apps and games
Now just download and read the install guide from 32biti.com/aplicatii-mobile/firmware/android-4-0-4-ics-pentru-samsung-galaxy-s-plus-i9001/
Guide of installation is in Romanian, but feel free to use google translate.