ST70 AP

I have tried to update the software on my ST70AP control head.
It is controlling an SPX10 auto pilot and networked thru a C120W

When I select the upgrade to download the transfer window appears but times out with a Transfer Failed message box showing "The data transfer to the target failed

SPX10 v3.05 and C120W v2.35 both have current software updates installed
ST70AP currently using v1.06

Also ST70AP reverts to 1st time set up screen every time it powers on.
hopping software upgrade fixes this

Any idea why upgrade will not load.