@somzuth : I'm having the same issue. Deco app is not updating the decos to the latest firmware version per mentioned on - https://www.tp-link.com/us/support/download/deco-m9-plus/#Firmware.

Even trying to use upgrade utility seem to be buggy and not working in Windows 10. Keeps saying id/password is incorrect.

@tkcool 

Once a firmware update has been released, I can't imagine that it's much work to allow the iPhone app to use it. A previous post here indicated that updates are made available at different times but taking no more than 2 weeks. Here we are months after they're available and still nothing.

In order to get from 1.2.x to 1.4.0 you will need to use a utility below. This method is needed as the browser access is not enabled in 1.2.x. After this update, you would not need to use this utility again.

Here is a link to the firmware: link

After you extract the folder there will be a pdf with screenshot instructions on how to update it.

If you are having trouble logging into the Deco via the utility, use this utility instead:

Windows: link

Mac: link

@Tony : Thanks for your reply.

I'm having issue while login in to the Utility that I've downloaded from the https://www.tp-link.com/en/support/download/deco-m9-plus/#Utility. I did try the link you've provided in your reply. I'm having the same login issue. Any idea if I'm missing anything here. BTW, I'm trying in Windows 10.

@Tony 

Thanks for the information but is there any reason why the iPhone app can't be used to update the firmware? 

@tkcool 

Use the windows link to the bottom of my first post, try that utility instead.

@somzuth 

The same applies to Android, it's not just iOS. After you do this update then you should be able to use the app to update for future releases.

@Tony : I did try the link from the bottom of your first post. I'm having the same login issue using that utility.

FYI this is the URL from your first post I've tried: https://static.tp-link.com/2020/202007/20200715/M9Plus_2.0_upgrade_tool_v1.1.1_Windows.zip

@tkcool 

If you go here: www.tplinkcloud.com

Log in with the same email and password you were giving the utility do you log in? Or does it say there is an error? The site is to verify the credentials are correct.

If the login is successful, do you happen to have other computers you can try to use the utility?

@Tony Just tried the credentials I was trying in Utility before, it did work on www.tplinkcloud.com and I was able to login successfully.

Unfortunately, I don't have another computer to try the utility on.

@tkcool 

Please reach out to our support team as they will be able to look into it further for you to see what may be preventing you from logging in: 

https://www.tp-link.com/us/support/contact-technical-support/#LiveChat-Support