https://blog.grandstream.com/faq/gnu-general-public-license/gnu-gpl-information-download
CHANGE LOG
This section documents significant changes from previous versions of user guide for GXV34x0. Only major new features or
major document updates are listed here. Minor updates for corrections or editing are not documented here.
Firmware Version 1.0.1.1
Product Name: GXV3480 / GXV3450
This is the Initial Version.
Firmware Version 1.0.0.4
Product Name: GXV3470
This is the Initial Version.