A Catalyst may seem "dead" if a firmware update fails to complete itself. If the Catalyst fails to update:
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Power down the amp and close the Updater app.
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Open the Updater again, then power up the Catalyst while holding A and B to put the unit into bootloader mode.
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You will then need to manually select the correct Catalyst product from three choices presented by the Updater.
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Select the latest firmware version, then accept the Terms and Conditions.
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After the update is complete, power down your Catalyst amplifier, then RESET the amplifier by holding down the B and MANUAL channel buttons while turning the power switch back on.