VLAN capabilities are usually only found in enterprise switch products. I'm fairly sure that the built-in switch in the router is a 'dumb' switch so it's most likely not possible to give VLAN functionality via firmware update.
I agree, but DIR-320 and 620 both have this function, while they aren't enterprise products.
I highly doubt there will be any further updates for the 655 considering it is EOL.
DIR-655 is no more in production?
The problem is that my new ISP is offering IPTV only through VLAN, which means that I will can't use my 655 for this purpose. Still, there is a solution. By default, they are offering DIR-100, so I can connect my DIR-655 to 100 and share Internet through WiFi (DIR-100 is wired only).
My goal was to use only 655 for IPTV and Internet, excluding the combination I described earlier.
Btw, is this working? I mean, can I enable VLAN with this instruction?
http://lizzi555.dyndns.org/655/StaticRoute.html