Begin with Hub turned off and unplugged. Make sure SD card is fully inserted into the Hub.
The SD slot is spring-loaded. Push in until the card clicks into place. Do not force it.
Connect in the following order:
- USB from Hub to 3D printer (skip for Bambu Lab printers).
 - Ethernet from Hub to router or network switch.
 -  Power supply.
 
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Your hub will begin booting up.