WARNING:
When upgrading from 1.0.3.x to 1.0.5.x, GXV34xx will perform factory reset automatically. Please ensure to back up data to external storage before upgrading. After upgrading GXV34xx to firmware 1.0.5.x, downgrading to a 1.0.3.x or lower firmware version is not allowed. 

GXV3450 1.0.5.15: Release Notes    Download Firmware

GXV3470 1.0.5.14: Release Notes    Download Firmware

GXV3480 1.0.5.14: Release Notes    Download Firmware