begginer problem

Hello, I have the problem connecting to the phone with osmocom tool. For what I have read on this list trying to run helloworld example app should work, and if there are problems connecting they stem from the cable/adapter being low quality. For now I have tried with three different usb-rs232 adapters (2 on winchiphead ch341 chip then I switched to prolific PL-2303 chip) and with 3 different phones (1xC155 and 2xC121) but in any of those configs I am not able to successfully run helloworld - it doesn't receive 'prompt' message as written in wiki - CompalRamLoader. Instead for C121 I always get: ./osmocon -p /dev/ttyUSB0 -m c123 ../../target/firmware/board/compal_e88/hello_world.compalram.bin got 1 bytes from modem, data looks like: 00 . got 1 bytes from modem, data looks like: 7e ~ got 5 bytes from modem, data looks like: 82 bf 7d fd 7f ..}.. got 1 bytes from modem, data looks like: 00 . got 1 bytes from modem, data looks like: 51 Q got 1 bytes from modem, data looks like: d2 . got 1 bytes from modem, data looks like: 51 Q got 1 bytes from modem, data looks like: 0a . got 1 bytes from modem, data looks like: 3a : got 1 bytes from modem, data looks like: 02 . got 1 bytes from modem, data looks like: a3 . got 1 bytes from modem, data looks like: a3 . got 1 bytes from modem, data looks like: da . got 1 bytes from modem, data looks like: 00 . got 1 bytes from modem, data looks like: 00 . I tried to stty different port speeds but still only got above sequence. Have you got any suggestion what could be the problem or what direction should I follow to get it working?