Question:  I'm in the process of upgrading my Eclipse Median frame from ECS 5.1 to ECS 5.2.  Can I process multiple panel type firmware upgrades at the same time or is the firmware updater only capable of one type of panel upgrade at a time?

Answer:  The ECS firmware updater normally can support upgrades of multiple panel types simultaneously with the exception of upgrades to V-Series panels (pushbutton, lever key and rotary panel versions). 
The V-Series panels firmware is much larger than other panels’ firmware and as such cannot be stored in flash memory in the rack, as other panels firmware can be; it has to be retained in the buffer used to store firmware which is in the process of being downloaded to panels.
The result is that if a V-Series panel upgrade is occurring and another panel type upgrade is begun, that new upgrade will over-write the V-Series panels firmware - in the middle of the V-Series panels upgrade. This breaks the upgrade. The recommended solution is to upgrade V-Series panels last.
We also recommend that you do not make any map apply changes (downloads) during a V-series panel upgrade.