Many Symbian users experience installation problems with mobile apps-most notably with software certificate validity. In this article, you will find an easy fix to “Expired Certificate” error in the Nokia Symbian phones (S60v5 and Symbian^3).
Certificate errors are very common in Symbian phones. The certificate errors are caused because of the security measures introduced into the new version of Symbian mobile OS, disallowing installation of old applications and invalid certificates. Each application for Symbian has a certificate, typically valid for six months from the date of issuing. When this time period over, your app will start displaying “Expired Certificate” which is what blocks these apps from installing.
Fix Expired Certificate Error
Your first option is patience: most developers can and will update their apps to be compatible with your latest firmware, but you never know how long will it take.
Fortunately, there’s a way to bypass Application compatibility check. Sign4ever is a simple application to solve the “Expired certificate” problem. Using this app is super easy which we show you in two easy steps.
a) First, download Sing4ever on your PC. Copy the incompatible application (.sis or .sisx file) and Sing4ever in the same folder. Run Sing4ever and follow the instruction that appear on blue screen- you just have to press any key to continue.
b) After you press any of your key, the blue screen will disappear and you will see two files in your folder- Signed.sis and .BAK . Just rename this Signed.sis file to the original app name. You are done ! Just copy this file in your Nokia phone for installation.
I’ve fixed certificate issue for one of my favorite free PDF reader app, AlternateReader. The application now working like a breeze.
From now, you can easily make application certificate, valid for the next 20 year ! A word of warning, however: while some or all of your “incompatible” apps may indeed install and run just fine on your mobile, there’s a potential downside: one or more rouge apps might wreak havoc, preventing the phone from running properly. So, make sure you are installing app developed by a trusted source/developer.