If you are the developer updating an app to a new version like S 120, you must follow these steps in your development environment:

Installation Steps

Step 1: Uninstall the Old Version (Recommended) While it is possible to install an update over an existing installation, clean installing the s 120 apk updated prevents conflicts. Go to Settings > Apps > S 120 > Uninstall.

Updating to the latest version is straightforward. Here's a step-by-step guide:

Sign the APK: An update will only install over an existing app if it is signed with the same Keystore and signature key file as the original version.

Increment the Version Codes: In your build configuration (such as the module build.gradle file), you must increase both the versionCode (an integer used internally by the system) and the versionName (the user-visible string, e.g., "S 120").