What TFTP server are you using? Do you have a second computer where you can setup a TFTP client and test that server? If you do a netstat to show UDP ports, is port 69 bound to a physical interface or loopback? On Windows this would be "netstat -an -p udp | findstr 69" for most Linux "netstat -aun | grep 69" should work.Official noob man here. I am having trouble with the transfer timing out when I attempt to install the new bootloader on my 6610 from the tftp server. I went through the whole thread and found one other dude who had the same issue but it was because his firewall was enabled. I already tried doing it with my firewall disabled (as that fixed it for him) and, son of a biscuit, it still didn't work. I have tried multiple ethernet cables for the connection from the management port to the network and from my laptop to the network but to no avail. I'll try another cable each tomorrow and see but I'm doubting that is the fix at this point.
I saw someone else who had a kind of similar issue and it was because they had some sort of janky digit-ery where their mac address should have been, so I checked mine and it seemed (to my untrained eye) to be formatted correctly for a mac address. I'm really hoping this is just some stupid thing I've overlooked but I just can't figure out what that might be at this point.