Nokia OS Wont allow you to install any unsigned applications In Your Mobile.. It Will Show Certificate Error.. You Have to Sign These Applications By Obtaining Key file and Certificate File.. Get Certificate and Key file From http://cer.opda.cn/en/index.php??module=index 1. Click Register and Create Your Username And Password. 2. Now Click Login Enter Details..   3.After Login -- Click My Certificate -Apply Cer ( … [Read more...]