Very important so listen up
When Nokia’s first Symbian Smartphone,7650 was launched it doesn’t require signing to install applications. As a result of which, it was more prone to virus attack.
There was no need of signing applications for installation till Symbian S60v2. Since, S60v3 Nokia took this initiative as a security measure. By applications i mean all type of .sis and .sisx files, which includes softwares, games and themes.
Nokia 5530,5800,5230,C6 e.t.c is based on Symbian S60v5 OS, so it requires signing. If an application is already signed you will be able to install it, otherwise you will receive this error message “Certificate error, contact application vendor”. Initially the signing process was very cumbersome but now simpler online methods are available.
In this tutorial i will show you how to sign unsigned applications online in a few simple steps -
1. Open this URL in your web browser
http://cer.opda.cn/en.You will see register on top right of you screen as in the above screenshot. Register and then login to your account.
2. After logging in click on “Sign Software” as in above screenshot. There you will see “Apply Cer”.Click on it.
3. It will take you to the above screen. Enter your model number i.e 5530. The Phone number should start with 134 or 135 and it should be 11 digits other wise you will get error. Check your phone’s IMEI number by typing *#06# on your phone’s virtual keyboard .”Remarks” is just for your reference. After applying you have to wait for 24 hours.
4. After 24 hours when you will click on “Apply Cer”.You will see 3 new options as Signing Software, Cer and Key. Click on “Signing Software” and it will take you to upload screen. You should also save “.cer” and “.key” file. In the next tutorial i will show you how to sign applications directly from your phone using these files.
5. Here you can upload the unsigned software.Enter anything in “Remarks” field for your reference and click on Upload.
6. After uploading successfully you will see the above screen. Download the signed application it is ready for installation on your Phone.
The first 4 steps you have to perform for the first time only. After wards you can just login and upload any unsigned software to get it signed.
The process is easy, but if you face any difficulty feel free to ask through the comment form given below.