Yes, the setting of the unlocked HG612 is unchanged except the GUI is unlocked and telnet enabled. It shows the following enabled:-
G.DMT (that's ADSL), ADSL2, ADSL2+, VDSL2.
So it will train down to what comes down the line. I think your theory is correct
. (Struck out because BatBoy is probably correct, later in the thread).
If you unlock your HG612 you could disable all except VDSL2 and see what happens.
Just a thought - let's check it isn't already unlocked and someone has played with it. Can you get to 192.168.1.1 login screen if you connect an Ethernet cable from its LAN2 to any Ethernet port on your router? Though if there is a tab stuck over LAN2 it isn't likely.
Another thought. Where is the customer's old modem/router? Plug it into the test socket, which is now behind the interstitial plate
The indispensable man or woman passes from the scene, and what happens next is more or less the same thing as was happening before.
My broadband basic info/help site - www.robertos.me.uk.
Domains, site and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync 57676/14040kbps @ 600m. - BQM
Edited by RobertoS (Fri 24-Jul-15 00:05:07)