How to troubleshoot an iRobot that displays the message 'Roomba has encountered an unknown error' and is not functioning properly? Is it possible to fix this issue without professional help - Quora
iRobot™ Roomba™ 677 Wi-Fi Connected Multi-Surface Robotic Vacuum + Exclusive Bundle: Virtual Wall (RV677020)
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iRobot Roomba 960 Robot Vacuum Bundle- Wi-Fi Connected, Mapping, Ideal for Pet Hair (+1 Extra Virtual Wall) - Amazon.com
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