go to cer.s603rd.cn and insert your imei (to get imei number,press *#06# on standby screen) number at proper box and insert the verification number and press the right button beside the verification code.then wait for 24hour and repeat this method. You will directed to the link to download your device certificate.
*this certificate is useful to sign installer because the new N95 firmware is hackproof so you cant hack your phone just by hellocarbide.
*to download installer signer, just go to cer.s603rd.cn and scroll down until you find three button. All you need is to click the middle button and it will directed you to download page