Can I get back to stock????

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http://androidforums.com – I've got a rooted S2 running a custom ROM. Is there anyway to get it back to stock (& be recognised by Kies) & re-enable the warranty? The info on the phone is as follows: Model: GT-I9100 Android Version: 4.0.3 Baseband Version: I9100XXLPQ Kernel Version: 3.0.15-I9100XXLPQ-CL22305 se.infra@SEP-94 #3 Build Number: IML74K.XXLPQ Thanks for any help Nez (General)