@emmiiz You're supposed to add the 2nd Deco X50 to your 1st Deco X50 (through Wi-Fi or Ethernet)

@NJS87 A diagram of your home with Deco models will help with giving a solution. Also, try running your network in access point mode.

@Blanker The deco that's connected to the ISP router/modem is the "main" Deco, and all other Deco model(s) connected to the main Deco via Wi-Fi/ Ethernet are "satellite" Decos. There's no "Wi-Fi"...

@Martyyyy XE75 V1 supports connection preference, I don't know why it's not showing up for you. Link to the support page (for help): How to select a preferred signal source on the Deco App

@BilalAlvi Either turn off wifi in your ZTE router or use the Deco X50 in access point mode

@MartijnFX Set QoS to 600 mbps