GXV3480 1.0.3.32 Firmware File    Release Notes 

GXV3470 1.0.3.32 Firmware File    Release Notes

 GXV3450 1.0.3.33 Firmware File    Release Notes 

    GXV3480 1.0.5.26 Firmware File    Release Notes    

  GXV3470 1.0.5.26 Firmware File    Release Notes  

 GXV3450 1.0.5.26 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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