@KTachyon Hi, have you tried to log into the Deco APP over 3/4G mobile data? And Can I have a screenshot of the error message when it kept saying incorrect password?

@XJRHD Hi, I see from the first pic, I thought the main Deco was at the back and on the router mode, so actually, it is the first unit connected to the modem via a switch and on access point mode,...

@KTachyon Hi, No there is no locally stored password. How about resetting again and setting up a simple password only with numbers and letters, no $ or # something like this?

@XJRHD Hi, it is ok. But I suggest that you put the main Deco at the front and connect to the 1st switch:

@DanielTP Hi, did disabling SIP-SLG make any difference? Did you also try to turn off the Mesh Technology on the Deco APP for your laptop?

@bratmucha Hi, please try to turn off Mesh Technology on the Deco APP for the devices. Have you tried to change the DNS on Deco to be 8.8.8.8/8.8.4.4:How to change DNS server settings on my Deco? Did...