I have a Vigor2860Vn+

I have just upgraded the firmware to v2860_3744.zip (Firmware 3.7.4.4 - http://www.draytek.co.uk/download/support/v2860_3744.zip).

I installed this, and everything attached to my wireless LAN "lost the wireless network".

The root cause is the strength of the 2.4 ghz network went from strong, to nothing. I moved to channel 6 (from 11), but there was no difference.

I rolled back to 3.7.4.2, everything is now back to normal.

I would strongly recommend that you are cautious with this upgrade, if you have a Vigor2860Vn+ box.

Thanks

Miles.

I note that DFS support has been added in 3.7.4.4 so when changing 5 GHz it'll stop broadcasting for 60s, but that doesn't explain why 2.4 would not be broadcasting...

HI

Same issue here, I have a 2860n-plus

As soon I upgraded to 3.7.4.4 the 2.4GHZ network disappeared.
I can scan network but all the devices cannot see the 2.4GHz network.
The 5ghz is fine.
It looks like is a FW issue

Confirmed, exact same issue here..
3.7.4.4 no 2.4GHz Wireless.

Furthermore... the draytek tech support have no idea of the problem.
They keep saying there are no known issues with firmware 3.7.4.4

Weird one. An idea - try taking a backup of the cfg and then .rst flash with 3.7.4.4 (which will factory reset as well) and afterwards reload the cfg.