Error loading firmware onto Motorola C115.

Hi, I am trying out osmocom-bb with the Motorla C115. I have compiled libosmocore as a shared library and osmocom successfully. Also, I have compiled a "arm-none'eabi" cross toolchain from scratch. I get the following error: $ osmocon -p /dev/ttyUSB0 -m c123 ~/osmocom-bb/src/target/firmware/board/compal_e88/hello_world.compalram.bin got 1 bytes from modem, data looks like: 00 . got 2 bytes from modem, data looks like: 00 00 .. got 4 bytes from modem, data looks like: 1b f6 02 00 .... got 1 bytes from modem, data looks like: 41 A got 1 bytes from modem, data looks like: 01 . got 1 bytes from modem, data looks like: 40 @ Received PROMPT1 from phone, responding with CMD read_file(/home/ravi/osmocom-bb/src/target/firmware/board/compal_e88/hello_world.compalram.bin): file_size=25184, hdr_len=4, dnload_len=25191 got 1 bytes from modem, data looks like: 1b . got 1 bytes from modem, data looks like: f6 . got 1 bytes from modem, data looks like: 02 . got 1 bytes from modem, data looks like: 00 . got 1 bytes from modem, data looks like: 41 A got 1 bytes from modem, data looks like: 02 . got 1 bytes from modem, data looks like: 43 C Received PROMPT2 from phone, starting download handle_write(): 4096 bytes (4096/25191) handle_write(): 4096 bytes (8192/25191) handle_write(): 4096 bytes (12288/25191) handle_write(): 4096 bytes (16384/25191) handle_write(): 4096 bytes (20480/25191) handle_write(): 4096 bytes (24576/25191) handle_write(): 615 bytes (25191/25191) handle_write(): finished got 1 bytes from modem, data looks like: 1b . got 1 bytes from modem, data looks like: f6 . got 1 bytes from modem, data looks like: 02 . got 1 bytes from modem, data looks like: 00 . got 1 bytes from modem, data looks like: 45 E got 1 bytes from modem, data looks like: 53 S got 1 bytes from modem, data looks like: 16 . Received DOWNLOAD NACK from phone, something went wrong :( got 1 bytes from modem, data looks like: 66 f got 1 bytes from modem, data looks like: 74 t got 1 bytes from modem, data looks like: 6d m got 1 bytes from modem, data looks like: 74 t got 1 bytes from modem, data looks like: 6f o got 1 bytes from modem, data looks like: 6f o got 1 bytes from modem, data looks like: 6c l Received FTMTOOL from phone, ramloader has aborted got 1 bytes from modem, data looks like: 65 e got 1 bytes from modem, data looks like: 72 r got 1 bytes from modem, data looks like: 72 r got 1 bytes from modem, data looks like: 6f o got 1 bytes from modem, data looks like: 72 r got 1 bytes from modem, data looks like: 00 . got 1 bytes from modem, data looks like: 00 . got 1 bytes from modem, data looks like: 00 Can the error be because of the toolchain ? Or can it be that my device is refusing connection with osmocon ? Thanks in advance. Ravi Sharan