Once connected to your Wi-Fi, the app can detect and install new versions during "idle" times (usually between 3 AM and 5 AM) so it doesn't disrupt your day. HUAWEI Global The "Hidden" Options Issue HG531s V1 300Mbps Wireless ADSL2+ Router - User Guide
Before updating or troubleshooting, you need to know what you are running. Follow these steps: Hg531s V1 Firmware