I think you mean you have a DC-ME-01T-C (JTAG'less custom module)? -S modules only support Digi's plug and play firmware.
If the ME is new enough, you can start the recovery process by shorting pins 18 and 20 to ground. When you do this you'll see a recovery menu on the serial port @ 9600/8/n/1 no flow. When C's start coming out of the serial port, use hyper terminal and do an Xmodem file transfer of the new image.bin. If it's too old and the recovery isn't built in to be enabled by shorting these pins, you have to figure out how to corrupt the application images flash (probably not possible unless you're doing something bad in your code), or it's now a paper weight.
If the module has a JTAG on it, you can use the ESP -> Help -> Recovering a Device process to recover the module.