Did you modify the CP2102 module so it can assert DTR thru a 0.1uF cap and reset the uC as part of the programming process?
What you need to do with the CP2102: Cut the trace that goes to reset near the pin. Connect DTR thru a 0.1uF cap to the reset pin.
To connect the CP2102 to board: TX to TX, RX to RX, reset to reset, V+ to V+, and GND to GND.