i9100p wont update

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http://forum.xda-developers.com – i got a problem with an i 9100P android 2.3.6 tim each try i do to flash or reset it wont update, it gives me passed but phone is back as before, i tried to unistall apps and account but is allways the same. thats very weird. tried with kies too, it detects phone, advice me of ics update i choose update and do not backup, it does all but on reboot i have phone always on gingerbread. any hint? (HowTos)