how could I hook a boolean function and change the return value with frida?

Question

I am new to frida and I tried several methods with no luck.. I am attempting to modify the return value of the boolean function to be false but I keep getting the following error: Process crashed: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean com.cgflauowyeim.pxhvwigtoc.App.I()' on a null object reference

This is the class:

public class App extends Application {
    private static App M;
    public libInterface f = null;
    public int g = 0;

    /* renamed from: K  reason: collision with other method in class */
    public boolean m42K() {
        return false;
    }

    public boolean I() {
        try {
            if (!Build.FINGERPRINT.startsWith(v.K((Object) "\u000fQ\u0006Q\u001a]\u000b"))) {
                if (!m42K()) {
                    if (Build.FINGERPRINT.startsWith(u.K("&a&e?d")) || Build.MODEL.contains(v.K((Object) "S\u0007[\u000fX\rk\u001bP\u0003")) || Build.MODEL.contains(u.K("\rg=f)~'x")) || Build.MODEL.contains(v.K((Object) "/w-\u0014\u0010\f^\u0014\u0018\\\u0007Z\r")) || Build.MODEL.contains(u.K("Y<k&n)x,*\u0018I")) || Build.MODEL.contains(v.K((Object) ")Z\fF\u0007]\f\u0014;p#")) || Build.MODEL.contains(u.K(";n#U/z e&o")) || Build.MODEL.contains(v.K((Object) "u'g8")) || Build.MODEL.contains(u.K("\u00102pz:e")) || Build.MODEL.contains(v.K((Object) ">]\u001a@\u001dU\u0004")) || Build.MODEL.contains(u.K("\u001eG?k:o")) || Build.MANUFACTURER.contains(v.K((Object) "$}%}<q,")) || Build.MANUFACTURER.contains(u.K("\u0005E\nC\u0004O")) || Build.MANUFACTURER.contains(v.K((Object) "b%C\tF\r")) || Build.MANUFACTURER.contains(u.K("\\!x<)f")) || Build.MANUFACTURER.contains(v.K((Object) "e-y=")) || Build.MANUFACTURER.contains(u.K("&a&e?d")) || Build.MANUFACTURER.contains(v.K((Object) "s\rZ\u0011Y\u0007V\u0001X\r")) || Build.MANUFACTURER.contains(u.K("\u000fo&s%e<c'd")) || ((Build.BRAND.startsWith(v.K((Object) "\u000fQ\u0006Q\u001a]\u000b")) && Build.DEVICE.startsWith(u.K("m-d-x!i"))) || v.K((Object) "S\u0007[\u000fX\rk\u001bP\u0003").equals(Build.PRODUCT))) {
                        return true;
                    }
                    return false;
                }
            }
        } catch (Exception unused) {
        }
        return true;
    }

    public void onCreate() {
        super.onCreate();
        if (!I()) {
            try {
                if (M == null) {
                    K(this);
                }
                Thread.setDefaultUncaughtExceptionHandler(new u());
                o.K().m50K();
                v.K().m55K((Context) this);
                aa.K().I();
                l.K().I(this);
                startForegroundService(new Intent(this, ServiceHandler.class));
                I();
            } catch (Exception unused) {
            }
        }
    }

    private static synchronized /* synthetic */ void K(App app) {
        synchronized (App.class) {
            M = app;
        }
    }

    /* renamed from: K  reason: collision with other method in class */
    public void m41K() {
        try {
            System.exit(0);
        } catch (Exception unused) {
        }
    }

    public static App K() {
        return M;
    }
}

This is my frida script:

Java.perform(function() {
  var App = Java.use('com.cgflauowyeim.pxhvwigtoc.App');
  App.I.implementation = function() {
    console.log('I method called, returning false');
    return false;
  };

  // Register a hook that is executed before the onCreate method is called
  App.onCreate.before(function() {
    console.log('onCreate method called, replacing I method');
    App.I.implementation = function() {
      console.log('I method called, returning false');
      return false;
    };
  });
});

I managed to bypass the vm detection editing the smali code and compiling it back but I would like to try to achieve the same result using frida. also i tried to enumerate the overload but didnt find any and kept getting the same error "Attempt to invoke virtual method 'boolean com.cgflauowyeim.pxhvwigtoc.App.I()' on a null object reference".

Any ideas?