Cisco catalyst switch 3560 problem

I have cisco 3560 switch (ws-c3560-48ts)now.I
accident deleted flash file and then I download flash file and I save
the flash file and reload.I successful save flash file but i can’t
enter running express setup mode.That why i do resetting the switch
but the switch didn’t behave like an unconfigure switch.When power
started ,syst and stat LED are turn green and i can’t enter express
setup mode so i can’t manage from web console.Pls help me how do i
do.I want factory default setting and use express setup mode.According
to the Running Express Setup,I press and hold the Mode button for 3
seconds but the switch can’t acts as a DHCP server.I want to the
switch acts as a DHCP Server using the Express Setup Mode