WARNING: Once GCC system is upgraded to firmware 1.0.3.x or higher firmware, downgrading to 1.0.1.x is not allowed.

GCC601x System Firmware 1.0.7.69: Release Notes    Firmware File

Note:
A single complete firmware file gcc601xfullyfw.bin can be used for upgrading GCC system and PBX module.
The single complete firmware file can be downloaded here:
Release_GCC601xFullFW_Sys-1.0.7.69_PBX-1.0.27.94