Cant change fingerprint in Bulid.prop (only certain things change) Dropad A8

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http://androidforums.com – I couldn't update fruit ninja as it says it is no longer compatible (i have started a different topic for this), so i thought changing my fingerprint in build.prop may do the trick. I changed it to: samsung/GT-P1000/GT-P1000/GT-P1000:2.3.6/GINGERBREAD/BOJU3:user/release-keys Now when i go into build.prob i edit the fingerprint back to my previous version (i do this because it made no difference and now google play wont work) but when i restart it, it is still the fingerprint above. Yes i am rooted, i know this because i have used root checker and when i change my screen density in build (General)