flash it with uspu or saras
Ericsson tool 1.7 by saras have some option to de-tamper, it works sometimes with me..
<br /><a href="http://www.gsmfactory.com/software/download.php3?ID=7&path=7_Ert2_1.7.zip" target="_blank">http://www.gsmfactory.com/software/download.php3?ID=7&path=7_Ert2_1.7.zip</a>