Nokia 230 Dual SIM RM 1172 RM 1173 Latest Flash File Free Download Have you ever faced this issue while trying to install an app. Today Im going to tell you how to remove this error. What youll need is the Free Signer app. Download it from the button below Download Size: 42Kb Steps: 1. Open the App 2. Click Add task and select the app 3. Select Self Sign Sis from the menu 4. Now Select Go from the Options Menu 5. And you are done! Now go and install your app. A new sis file will be created with -signed added to the original name. Open it . download file now