Thx ph0enix. You're very helpfull. Let me try to explain a little better:
I'm testing the router with : 01 Vaio win 7 64 bits Notebook (wireless), an ordinary cell phone (wireless), a wired VoIP Granstream ATA, a wired net 01 TB Iomega disk, a wired PC.
All devices have DHCP reservation in DIR-685 and I'm using MAC network filter.
About the upgrade, I was able to upgrade with Europe - World Wide fw. I ordered the router from Malasya.
As far as I could test, wireless connections has no problem until now.
The current problems I have:
1) I couldn't put USB ports and/or SharePort to work.
2) It seems wired hub has problems: all my cables are ok, coz it was working with a DIR-655. Anyway I checked cables again, and they are ok. The problem is: the ATA and the Net Disk have problems to connect with the router. In a time they are working ok, but sometimes, when I reboot router, for example, they occasionally lose connection without explanation.
3) LAN status in router's web page is completely inconsistent... show one, show two, show nothing...
I couldn't test Storage features yet. I'm waiting the HDD.
I read all the posts about DIR-685.
Thx again.