The steps to get the certificate and the key to sign applications for our Nokia N8 or any other Symbian^3 device, are very simple, then show you how to get cer and key .
STEP 3: GET CER and KEY.
click on the orange box “Apply cer”
Now fill the fields.
To get the IMEI by pressing *#06# and will appear it.
and if all is well …
Now we have to wait our certificate and the key to our Nokia some days. Each time you return to enter in OPDA, click on “My Certificates”, you should see something like that
STEP 5: DOWNLOAD.
Now Click on Cer to download the certificate and click on Key to download the key