You need a compatible OBD adapter. The developer recommends:

Note: Cheap $10 ELM327 adapters struggle with the high-speed CAN bus required for BCM writing. Spend $45.

Before discussing the "Mod APK," it’s crucial to understand what the real Jscan software does.

Jscan is a lightweight but incredibly powerful diagnostic app available on the Google Play Store (Android) and the Apple App Store (iOS). Unlike generic OBD2 scanners that only read basic "P" (Powertrain) codes, Jscan dives deep into every module on your vehicle, including:

Even if you find a mod that isn't malware, many features will be broken because they rely on cloud-based validation.