I have followed all the in instruction accordingly. (including turning on VLAN to choose Malaysia Unifi). the light on the deco remains Red. 

this are the steps I did. 

1. turn off unifi modem

2. connect Lan port 2 of unifi modem to deco port (either one) 

3. power on unifi modem

4. power on deco

5. all ok and I enter my own wifi network name (different from what already configured earlier by unifi technician). 

6. when asked to setup network for deco, I used a new name and password. 

7. when it try to connect to the new wifi network, the deco light remains Red.