@Kossie The very old Deco M9 Plus firmware is what causes all these issues and confuses Deco app. That old firmware can't be updated by Deco app. Use this document:...

@DavidStolk8 Tri-band Deco unit will deliver most improvements when connected to another tri-band Deco unit. Having single Deco X90 will not deliver substantial improvement, if combined with X60s....

@lainelaz In Deco mesh, Router/Access Point mode applies to all its Deco units. If you have Deco mesh with three Deco units configured this way: router>ethernet cable>deco1>wireless>deco2...

@no6 One more option for you to consider, if $400 is within your budget. Consider buying four X50s (2 2-packs) for the total of $440 at current sale price, decomission M9 Plus you have and cover your...

@no6 Makes it much easier, as I am in Canada, too. Right now Amazon Canada sells Deco X50 2-pack for $219.99 ($50 off regular price) and I can't find Deco XE75 right away, but Deco XE75 Pro 2-pack...

@no6 Price difference: I can't help you with that, you'll need to research what is available in your region, at what prices and so on. Here is an example of US Deco selection:...