ETC Congo Family v6.4.0 - Manual (Page 214)

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System Settings - Update
You can update software, and upgrade the number of outputs your system supports.
• To update the software you need a USB memory stick with the latest congo.exe file
from www.etcconnect.com that is inserted in a USB port before activating this tab.
• To upgrade the outputs you need an upgrade code from your ETC retailer.