This versiyon has write -read protect and you have 2 ways.
one of them my solution with charger 5v to pin 1(% 100 working) read that topics:
second is bootstrap 231 eraser (ı did not try now )also read that topics:
http://forum.gsmhosting.com/vbb/show...8&highlight=5v http://forum.gsmhosting.com/vbb/show...4&highlight=5v http://forum.gsmhosting.com/vbb/show...9&highlight=5v http://forum.gsmhosting.com/vbb/show...2&highlight=5v