We could probably use a little more information than this in order to help.
If you are updating software, except for the primary GDU 4XX displays, you should be in configuration mode looking at the System Information page and watching the progress of the PFD updating each device in the system.
It sounds like perhaps it is having trouble updating a GSA 28 servo, but monitoring the progress on the System Information page would confirm this.
You can press the MENU, BACK, and NRST buttons at the same time on PFD1 to reset it, then immediately press and hold the MENU to bring PFD1 up in configuration mode without removing power.
With a G3X Touch system, you can go in/out of configuration mode all day long without cycling power.
Once in configuration mode, go to the System Information page and watch the software updating process.
Steve