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haiderali91 haiderali91 at protonmail.comThanks Mychaela for replying in detail. Yes, there is no response on executing the whole command: $ sudo ./osmocon -p /dev/ttyUSB0 -m c123xor ../../target/firmware/board/compal_e88/hello_world.compalram.bin However, when i execute the following: $sudo ./osmocon -p /dev/ttyUSB0 It returns: Cannot open serial device /dev/tty/USB0 Trying to figure out the problem.. ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐ On Wednesday, December 26, 2018 9:16 PM, Mychaela Falconia <mychaela.falconia at gmail.com> wrote: > > I have also attached a cu terminal by using following command. > > $ sudo cu -l /dev/ttyUSB0 -s 115200 > > The cu terminal displays this message on pressing power button. > > [garbage characters]ftmtoolerror > > The series of non-printable-ASCII characters followed by "ftmtoolerror" > is exactly what Compal's bootloader emits on boot (the non-printable- > ASCII characters constitute PROMPT1 for a possible external code > download), so the fact that you are seeing these characters with your > cu terminal proves that your phone is good (has an unlocked bootloader) > and that your serial cable is good at least in the phone to PC > direction. It is possible that your cable may be broken in the PC to > phone direction, or that the headset jack connection inside the phone > itself is broken in that direction - I have seen such broken headset > jack connections on some busted-up phones. However, this other part > of your report raises other concerns: > > > sudo ./osmocon -p /dev/ttyUSB0 -m c123xor ../../target/firmware/board/compal_e88/hello_world.compalram.bin > > But I am not getting any response on pressing power button briefly. > > The command keeps on executing without any message. > > Are you saying that absolutelyno messages whatsoever appear in the > console window where you run osmocon as you press thr power button on > the phone? If so, then you must have some other problem, as osmocon > should at least report that it got PROMPT1 from the phone, even if it > is not successful in talking back to the phone. > > M~