diff --git a/app/app.go b/app/app.go
index 6198696fd..290d022f3 100644
--- a/app/app.go
+++ b/app/app.go
@@ -147,7 +147,7 @@ func runWarpWithPsiphon(ctx context.Context, l *slog.Logger, opts WarpOptions, e
 	}
 
 	// run psiphon
-	err = psiphon.RunPsiphon(ctx, l.With("subsystem", "psiphon"), warpBind.String(), opts.Bind.String(), opts.Psiphon.Country)
+	err = psiphon.RunPsiphon(ctx, l.With("subsystem", "psiphon"), warpBind.String(), opts.CacheDir, opts.Bind.String(), opts.Psiphon.Country)
 	if err != nil {
 		return fmt.Errorf("unable to run psiphon %w", err)
 	}
diff --git a/psiphon/p.go b/psiphon/p.go
index c8141880e..4fe4c42f3 100644
--- a/psiphon/p.go
+++ b/psiphon/p.go
@@ -103,8 +103,6 @@ func StartTunnel(
 	configJSON []byte,
 	embeddedServerEntryList string,
 	params Parameters,
-	paramsDelta ParametersDelta,
-	noticeReceiver func(NoticeEvent),
 ) (retTunnel *Tunnel, retErr error) {
 	config, err := psiphon.LoadConfig(configJSON)
 	if err != nil {
@@ -147,14 +145,6 @@ func StartTunnel(
 		return nil, errors.New("config.Commit failed")
 	}
 
-	// If supplied, apply the parameters delta
-	if len(paramsDelta) > 0 {
-		err = config.SetParameters("", false, paramsDelta)
-		if err != nil {
-			return nil, fmt.Errorf("set parameters failed for delta %v : %w", paramsDelta, err)
-		}
-	}
-
 	// Will receive a value when the tunnel has successfully connected.
 	connected := make(chan struct{}, 1)
 	// Will receive a value if an error occurs during the connection sequence.
@@ -199,12 +189,6 @@ func StartTunnel(
 					}
 				}
 			}
-
-			// Some users of this package may need to add special processing of notices.
-			// If the caller has requested it, we'll pass on the notices.
-			if noticeReceiver != nil {
-				noticeReceiver(event)
-			}
 		}))
 
 	err = psiphon.OpenDataStore(config)
@@ -316,7 +300,7 @@ func (tunnel *Tunnel) Stop() {
 	psiphon.CloseDataStore()
 }
 
-func RunPsiphon(ctx context.Context, l *slog.Logger, wgBind, localSocksPort, country string) error {
+func RunPsiphon(ctx context.Context, l *slog.Logger, wgBind, dir, localSocksPort, country string) error {
 	// Embedded configuration
 	host, port, err := net.SplitHostPort(localSocksPort)
 	if err != nil {
@@ -342,7 +326,6 @@ func RunPsiphon(ctx context.Context, l *slog.Logger, wgBind, localSocksPort, cou
 		"AllowDefaultDNSResolverWithBindToDevice":true
 	}`
 
-	dir := "."
 	ClientPlatform := "Android_4.0.4_com.example.exampleClientLibraryApp"
 	network := "test"
 	timeout := 60
@@ -371,7 +354,7 @@ func RunPsiphon(ctx context.Context, l *slog.Logger, wgBind, localSocksPort, cou
 			}
 			return errors.New("psiphon handshake maximum time exceeded")
 		case <-t.C:
-			tunnel, err := StartTunnel(ctx, []byte(configJSON), "", p, nil, nil)
+			tunnel, err := StartTunnel(ctx, []byte(configJSON), "", p)
 			if err != nil {
 				l.Info("Unable to start psiphon", err, "reconnecting...")
 				continue