Beyond general troubleshooting, what advanced steps can be taken if the SmartTube 403 error persists on an Android device?

If basic troubleshooting fails, advanced steps include: 1. **Reinstalling SmartTube** completely from a trusted source (e.g., the official GitHub page). 2. **Checking your device's date and time settings** to ensure they are accurate, as incorrect time can cause SSL/TLS handshake failures leading to 403 errors. 3. **Testing SmartTube on a completely different network** (e.g., a mobile hotspot) to definitively rule out your home router or ISP issues. 4. **Reviewing router firewall settings** if you have access, as they might be inadvertently blocking necessary connections. 5. **Reporting the issue to SmartTube developers** with detailed information and logs if possible, as it might be a server-side change or an app bug requiring a patch.