The only way to unbrick your phone is whit a jtag interface , ( http://www.omnia-repair.com/forum/topic/htc-hd2-repair-guide , http://forum.gsmhosting.com/vbb/f475/ort-tool-v1-13-hd2-t-mobile-repair-file-htc-topaz-jtag-pinouts-htc-topaz-repair-file-1047977/ ) but maybe this kind of tools are...