por este dispositivo também tem outras instruções :
Notebooks - ThinkPad W540 (20BH) (3.15 mb)
Notebooks - ThinkPad W540 (20BH) (3.17 mb)
Notebooks - ThinkPad W540 (20BH) (3.14 mb)
Notebooks - ThinkPad W540 (20BH) (592.73 kb)
Notebooks - ThinkPad T540p (20BE) (3.05 mb)
Notebooks - ThinkPad T540p (20BF) (3.05 mb)
Notebooks - ThinkPad W540 (20BG) (3.05 mb)