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Thread: TEMS LT25i (Xperia V) DIAG-PORT problem- New LTE Band Activation

  1. #1
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    Question TEMS LT25i (Xperia V) DIAG-PORT problem- New LTE Band Activation

    Hello everyone,

    I want to try activation of LTE900MHz (Band-8) on this model by QPST. This band isn't found on standard configuration.
    I have TEMS-phone of this model (MSM8960, Android.4.0.4, ver.9.0.1.D.0.10-TEMS).
    The phone was rooted successfully by towelroot, installed SuperSU. Qualcomm drivers installed: in Diag-Mode LT25i detects as several USB-devices (diag, modem, serial, adb) with VID_0FCE&PID_5146, and drivers found at LT18i-driver pack.
    Diag-port (USB-dev=VID_0FCE&PID_5146&MI_04) activated:
    adb shell
    su
    setprop persist.usb.eng 1
    setprop sys.usb.config diag.adb

    But QPST can't find any phone behind diag-port. I tried everiting, but without success: port is open/visible, but no active phone at this port.

    I don't know what is the problem with diag-port:
    - drivers
    - forbidden access to modem at TEMS-firmware

    With modem, found as USB-dev=VID_0FCE&PID_5146&MI_02, no problem with communication (WindowsDeviceManager->ModemProperties->Diagnostics->QueryModem).

    I don't have standard LT25i to check.
    I checked on standard LT18i (ArcS) and standard D2303 (M2)- they are visible by QPST through diag-port (NV-memory is accessed).

    Do you have experience on this topic ? Any ideas/help?

    Regards,
    Last edited by tonyM; 2020-10-26 at 04:21 PM

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  3. #2
    VIP Member Reputation: 1852 carver's Avatar
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    Default Re: TEMS LT25i (Xperia V) DIAG-PORT problem- New LTE Band Activation

    I haven't answer. never encountered.

    perhaps TEMS intercepts the DIAG port on itself.
    although I thought that everything has been working via QMI for a long time.

    I would try with a program like tcp_serial_redirect.py to check the availability of ttyusb.
    you can kill tems pid, and try tcp_serial_redirect.py again.

    tcp_serial_redirect.py - it's old script from iphone4.
    need user any other ttyusb-to-ip. the socat probably. it muscan ttyusb in IP.

    QPST - can work with IP. no driver or serial port needed.
    /carv

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  5. #3
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    Default Re: TEMS LT25i (Xperia V) DIAG-PORT problem- New LTE Band Activation

    Quote Originally Posted by carver View Post
    I haven't answer. never encountered.

    perhaps TEMS intercepts the DIAG port on itself.
    although I thought that everything has been working via QMI for a long time.

    I would try with a program like tcp_serial_redirect.py to check the availability of ttyusb.
    you can kill tems pid, and try tcp_serial_redirect.py again.

    tcp_serial_redirect.py - it's old script from iphone4.
    need user any other ttyusb-to-ip. the socat probably. it muscan ttyusb in IP.

    QPST - can work with IP. no driver or serial port needed.

    Yes, you are right. Probably TEMS-process intercepts the DIAG port.
    When I kill the process "/system/bin/tems-server", it appears again with new PID.

    Attached you can find this file (and some other files from /system/bin/, which I found useful).
    Also the root processes and listing of /system/bin/.

    What you can suggest as next step?
    Attached Files Attached Files
    Last edited by tonyM; 2020-10-26 at 03:40 PM

  6. #4
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    Default Re: TEMS LT25i (Xperia V) DIAG-PORT problem- New LTE Band Activation

    I get the same info from my stock Xperia M2 (D2303, MSM8926)- see attachment.

    And I think that immortal process "tems-server" is a kernel-one.
    If it couldn't be stopped, may be I have to flash stock kernel in order to have DIAG-port working. What do you think?
    Attached Files Attached Files
    Last edited by tonyM; 2020-10-26 at 04:22 PM

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