When Calypso starts up it looks for a Cozmo device to connect to. If it can't find one, it pops up a warning message to let you know. In order for Calypso to find your Cozmo device, all of the following must be true:Cozmo must be awake. If he's asleep, take him off his charger and put him back on. His backpack lights should be flashing green (if he's charging) or steady green if fully charged. Once Cozmo has connected the lights will shut off.Your phone or tablet must be running the Cozmo app, and it must be connected to Cozmo via WiFi. Use the app's "Connect" button to establish a connection.The Cozmo app must be in SDK mode. If it's not, tap on the settings icon in the top right corner of the app screen and scroll to the right to find the "Enter SDK Mode" button. Tap on this button. When you do, the screen will go black and Cozmo will stop fidgeting and await further instructions.Your phone or tablet must be connected to your laptop via a USB cable. If your laptop cannot detect the phone/tablet, try using a different USB port.Your phone or tablet must be set to allow USB debugging. Even if you turn this on from the settings menu, you may be asked to confirm that this specific laptop is authorized to access your device in this way. Check the device to see if a confirmation window has popped up and is waiting for your input.Your laptop must have the necessary device drivers installed to communicate with your Android or iOS device. On Linux and MacOS, this isn't an issue. For Windows systems, the Calypso installer includes the device driver for the Fire tablet. If you're using a different Android device, check your system configuration to be sure that the necessary device driver has been located and installed. While this should happen automatically, sometimes it doesn't. If you're using an iOS device with a Windows laptop, iTunes must be installed on your laptop.Occasionally a Fire tablet becomes corrupted and lose its ability to support a USB connection. The problem can be fixed by doing a hard reset of the tablet. See the Help Center article on that.