I've tried Ctrl+ P and F2but they did not work. I can only see the AMT (enabled/disabled), CIRA and terminal option on BIOS setup, but I cannot see other AMT options like provision mode (entreprise or basic).
On my T410, if AMT was enabled in the BIOS, pressing Ctrl-P (repeatedly after boot) paused the system at the MEBx menu, with only one option listed: "Press 1 to enter ME configuration screens"
Pressing 1 got me into the standard MEBx window that I was used to, the one that prompts for the MEBx password, then allows you to configure the system.