Hi, I am trying to write osmocombb to Motorolla c118 phone by following the given [1] guide.I have successfully compiled firmware binaries but having issues while writing them to phone. I connected motorolla c118 via USB Serial To RS232 TTL to 2.5mm audio jack, using the given guide [2] When I run this command $ dmesg | grep tty I get the following output [ 0.000000] console [tty0] enabled [ 14.946936] usb 3-6: pl2303 converter now attached to ttyUSB0 [ 973.747957] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0 [ 1484.595816] usb 3-6: pl2303 converter now attached to ttyUSB0 [ 1845.344494] pl2303 ttyUSB0: pl2303 converter now disconnected from ttyUSB0 [ 2643.566407] usb 3-6: pl2303 converter now attached to ttyUSB1 And on running this $ sudo cu -l /dev/ttyUSB1 -s 115200 I get a connected message but no further progress is done. When i press Power button briefly, no activity is shown. I have tried with two phones but no success on any. I have checked the connectivity between headphone jack and USB serial chip via voltmeter, it is fine as well. Also tried by doing Master reset on phone but no use. What can be issue and how can i fix it. ? Kindly ignore any mistakes, i am new to this domain, couldn't find much help on google as well :( [1] https://osmocom.org/projects/baseband/wiki/Software_Getting_Started https://osmocom.org/projects/baseband/wiki/Osmocon [2] http://www.linuxx.eu/2014/09/osmocombb-hardware-and-software-setup.html [2]