@cacb I have done it in the Spanish site. If in country it is not available I do recommend to email to the support team. They will tell you which one you can use.

@HopSaSam At the web page. Deco -> Support -> Downloads -> Firmware (you have the firmware and the tool to update it.

@TP-Link_Deco As there aren't plans to update through the Deco App, I have updated the firmware today using the provided utility. Thanks.

@TP-Link Deco @Kevin_Z Could you please provide us an estimation of when we are going to be able to update the new firmware of M9 Plus v2 (1.4.0) using the Deco app? Interested M9 users, please press...

@TP-Link_Deco When will it be available at the Deco app? Thanks

@hearl4323 I am using a similar one. Slave deco connected by WiFi is serving (using the gigabit connections) a PlayStation and a computer.