Hello AtschyCH,
Please turn the cube over and check which number you have (4 or 2). If you already have a North Star Cube number 4, you need the number 2 as an extension, and vice versa.
Thank you and best regards
Your iRobot Team
Former user
6 years ago
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0
1
Since I don't understand the question, I can't give an answer.
What is a North Star Cube?