1. anon(6078578)'s Avatar
    I have a Lumia 640 on build 14393.187 and noticed that I am unable to connect it to my PC which is also running Windows 10. ie I am unable to access my SD Card to offload photos and video.

    If I look under Device Manager on my PC under Other Devices I can see the following error:

    The drivers for this device are not installed. (Code 28)

    A service installation section in this INF is invalid.

    To find a driver for this device, click Update Driver.

    I also tried to search for a driver without success.

    I have rebooted both the phone and the PC to no avail. Anyone else having this problem?
    09-16-2016 07:58 AM
  2. jmajid's Avatar
    might not be the problem, but make sure you are not on your lockscreen...
    that is, unlock your phone and get to the homescreen/start screen and see if that helps...
    vezycash likes this.
    09-16-2016 08:26 AM
  3. anon(6078578)'s Avatar
    might not be the problem, but make sure you are not on your lockscreen...
    that is, unlock your phone and get to the homescreen/start screen and see if that helps...
    Nope I always unlock my phone to use it :)

    It's annoying as I took a 10 minute video last night. With Photos I would normally just let it sync to Onedrive, but since the video is large and OneDrive seems to only upload at dialup speed regardless of whatever network I am on, that wasn't an option. Of course I could just crack my phone out of it's case and disassemble it but that's unnecessary hassle and wear and tear when it's easier just to mount it as drive!
    09-16-2016 09:08 AM
  4. RumoredNow's Avatar
    Try this...

    Download and extract USBDeview Inside the folder > right click the exe > run as admin

    Delete all drivers marked Nokia or Lumia >plug the device into USB and let a fresh set of drivers install.
    09-16-2016 11:48 AM
  5. anon(6078578)'s Avatar
    Try this...

    Download and extract USBDeview Inside the folder > right click the exe > run as admin

    Delete all drivers marked Nokia or Lumia >plug the device into USB and let a fresh set of drivers install.
    Thanks I'll try this this evening. Out of interest it also doesn't work on my Laptop which is odd.
    09-16-2016 12:11 PM
  6. anon(6078578)'s Avatar
    I had first tried removing the device from "Devices and Printers" and even uninstalling from Portable Devices in Device Manager. Didn't work for my Windows 10 Mobile phone or my Wife's Phone.

    I then tried the utility suggested by RumoredNow. No Dice with that either.

    After googling around, I found a solution that worked for me. In C:\Windows\INF I right clicked on wpdmtp.inf and selected install from the menu. All is now working. I had to do that twice ie first for my wife's phone then again when I connected mine.

    The Lumia device under Portable Devices in Device Manager no longer has a Triangle and the icon under Devices and Printers now shows a Lumia Phone Icon. I can now view the contents of my phone :)

    On a different note a friend just bought a Cricket Lumia 640 to play with from Target. He will be using it on Wifi only so no need to unlock. He just wants to play with the development of a UWP application to use with IOT on a Raspberry Pi.
    RumoredNow likes this.
    09-16-2016 10:24 PM
  7. anon(6078578)'s Avatar
    Just to check I removed the Lumia from "Devices and Printers" and then reconnected to reinstall the driver. Same problem, I had to reinstall the wpdmtp.inf in C:\Windows\INF. I guess my desktop version of Windows 10 has a bug. At least as far as our Lumias anyway.
    09-16-2016 10:38 PM
  8. abhishek singh21's Avatar
    reboot your device when it is connected to your PC, that way your pc will install default drivers all over again.
    09-17-2016 09:34 PM
  9. anon(6078578)'s Avatar
    reboot your device when it is connected to your PC, that way your pc will install default drivers all over again.
    Nope did all that. Like I say, the only way I get it to work is to install that INF file directly. It may be because that PC is still on build 1511. I had the same problem with both Lumia's ie the 8.1 and W10M one. If I remove the device to uninstall the driver it will indeed reinstall the driver, but once completed it will still not work ie has the yellow triangle. I then have to manually install the INF file as detailed above.
    09-17-2016 09:59 PM
  10. Swiss7599's Avatar
    I had first tried removing the device from "Devices and Printers" and even uninstalling from Portable Devices in Device Manager. Didn't work for my Windows 10 Mobile phone or my Wife's Phone.

    I then tried the utility suggested by RumoredNow. No Dice with that either.

    After googling around, I found a solution that worked for me. In C:\Windows\INF I right clicked on wpdmtp.inf and selected install from the menu. All is now working. I had to do that twice ie first for my wife's phone then again when I connected mine.

    The Lumia device under Portable Devices in Device Manager no longer has a Triangle and the icon under Devices and Printers now shows a Lumia Phone Icon. I can now view the contents of my phone :)

    On a different note a friend just bought a Cricket Lumia 640 to play with from Target. He will be using it on Wifi only so no need to unlock. He just wants to play with the development of a UWP application to use with IOT on a Raspberry Pi.
    Had the exact same issue and this worked perfectly. Thanks a bunch!
    10-26-2016 03:35 AM
  11. aravind732's Avatar
    thanks dude, it is working for me. great thanks
    12-16-2016 09:44 AM
  12. CaptainLumia's Avatar
    12-16-2016 03:20 PM
  13. pjhenry1216's Avatar
    i was just having the same issue with my HP Elite x3. That wpdmtp.inf trick worked for me as well. Thanks!
    03-09-2017 09:08 AM
  14. wobailey's Avatar
    THANKS FOR THE WPDMTP.INF INSTALL INFO... THAT WAS THE FIX FOR ME. Had just updated my 640XL to Window 10 Mobile and could not get it to discover on USB.
    03-17-2017 10:40 AM

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