Super Easy Way to upgrade to ICS Now without Rooting
Change your CSC Code to German and upgrade via KIES; this will also factory reset your phone.
so on phone :
*#272*IMEI# then change the CSC to DBT.
Phone will reset.
Change language to English (bottom right icon)
follow prompts to setup
Connect to KIES and the phone will update to ICS.
When your finished, you change the CSC code back to whatever you had before