How to change subnet mask for deco m9 plus?

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How to change subnet mask for deco m9 plus?

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
How to change subnet mask for deco m9 plus?
How to change subnet mask for deco m9 plus?
2020-05-03 02:49:25
Model: Deco M9 Plus  
Hardware Version: V1
Firmware Version: 1.3.0 Build 20190821 Rel. 54023

Hi, Im using Tm unifi ISP.  why my deco m9 plus will auto change the subnet mask format. 

I see from my apps, WAN 
the subnet mask 255.255.255.255
 

while my LAN 
the subnet mask 255.255.255.0 

How ot change back as default?

 

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