When performing firmware upgrades, it is highly recommended to download firmware to one panel at a time.
If possible, disable all other panels except the panel you are downloading firmware to. This will increase the speed of the firmware download and save time. The panels that are disabled, will function properly while offline.
Never perform firmware downloads to all panels at once. This is true especially on large systems. This process can take a very long time and make the system inoperable.
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