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

GCC601x System Firmware 1.0.7.44: Release Notes    Firmware File

GCC601x PBX Firmware 1.0.27.89:    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-1.0.7.44_PBX-1.0.27.89