Loading firmware on C118

Hi all, I'm using Motorola C118 and Prolific PL2303 USB to serial adaptor on Ubuntu 10.10. I'm trying to run $ ./osmocon -p /dev/ttyUSB0 -m c123xor ../../target/firmware/board/compal_e88/loader.compalram.bin and I got got 1 bytes from modem, data looks like: 00 . I press power button and nothing happens. If rub the connector - lines such as I provided above are appears. Is it means that cable is ok? And what could be the problem? Thanks, Pavel