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

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