GXV3480 1.0.3.24 Firmware File Release Notes
GXV3470 1.0.3.24 Firmware File Release Notes
GXV3450 1.0.3.24 Firmware File Release Notes
Note:
1. For GXV3450, it's highly recommended to upgrade to 1.0.3.24 for a touch screen issue fix.
2. After upgrading to firmware 1.0.3.4 or higher version, downgrading to firmware lower than 1.0.3.4 is not allowed.
HTTP Firmware upgrade path for official release is:
firmware.grandstream.com