How to enter BIOS setup in Sony Vaio SVT11125CGS
this will be helpful
so technically you use assist button when system is off...... than from rescue select the bios :-)
F2 does not work on my svt14112cxs, instead with the computer off, press the "assist" button and then select BIOS in the menu.
T series laptops have an assist button which should be pressed to get the option to Enter Setup.