How.do you downgrade the firmware? Thanks

@ARGamingPK1 The thing is, it used to work, and it worked for a few year. Noe it suddenly stopped. So maybe a firmware issue.

Hi all, I have 3 DECO X20 connected together via a switch. We using the operation mode - Access point - the fast roaming isn't working, although it is enabled. I need to turn off my phone WiFi and...