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Have W33 Modem with W21 Router and W11 satellite. Need to expand coverage. P:urchased set of W121s. Do I need to replace W21 with W121 as primary router, remove W11 and add W121 and W21 as satellites or can I just add W121s as satellites to W21? 

You can have up to 3 max units in a mesh network, 3 W21’s or 2 W21 + W11. 
 

Return the W121 and buy a W21 to add to your current setup. 

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