HOW TO SIGN UNSIGNED SIS FILE

Most of the Symbian apps available now are in beta version and is not signed. So problem can be faced when you install an unsigned app in Nokia symbian phones. You can sign it by the procedure explained below.

First you have to get certificate files from OPDA.CN .

• For that first you have to register there. 
• Then login and click apply for certificate. 
• Fill the boxes with your mobile  model and IMEI no.
• Now wait till the files are ready. When files are ready, dowload the cer and key files to your PC.

Download BinPDA Signer

• Now keep .cer , .key and signer app together in a single folder.
• Open BinPDA signer and select your .sis , .cer , .key files as shown in screenshot below.

Now press sign the sis button. Done. Your file is signed now.