Hello. I'm trying to load the loader.compalram.bin. The behaviour is very strange because sometimes the download is complete and successfull, sometimes; in particular, in this case, the download is complete, but any ACK is sent back from the mobile phone (see below). ./osmocon -p /dev/ttyUSB0 -m c123 ../.. /target/firmware/board/compal_e99/loader.compalram.bin got 2 bytes from modem, data looks like: 2e c8 .. got 5 bytes from modem, data looks like: 1b f6 02 00 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(../../target/firmware/board/compal_e99/loader.compalram.bin): file_size=21752, hdr_len=4, dnload_len=21759 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 (4096/21759) handle_write(): 4096 bytes (8192/21759) handle_write(): 4096 bytes (12288/21759) handle_write(): 4096 bytes (16384/21759) handle_write(): 4096 bytes (20480/21759) handle_write(): 1279 bytes (21759/21759) handle_write(): finished The target phone is C115. I tried compal_exx and the result is the same :-( Please, can someone help me to understand the reasons? Thanks in advance.