I'm currently working on a Universal 8.1 app. I've always deployed it for testing on my Lumia 535 without any problem. However, today I'm unable to deploy. I get this error code.
DEP6200 : Bootstrapping failed. Device cannot be found. 0x89731810: Deployment failed because no Windows Phone was detected. Make sure a phone is connected and powered on.
This problem occurred previously and disappeared when I updated my PC windows from build 10240 to 10586. Then I was using a Lumia 535 for deployment. Now I'm using a Lumia 640xl and the problem suddenly resurfaced. I've: - repaired my visual studio installation - changed USB cable - tried the proposed solutions in the below links (except reverting to Win 8.1 or factory reset).
Still the problem persists.
I've tried all the solutions from these links Windows phone 8.1 emulator not loading OS
Error : DEP6200 : Bootstrapping 'Device' failed. Device cannot be found
Tools for Apache Cordova DEP6200 Windows Universal App Windows Phone Won't Connect
Fail to run an app developed on desktop (Visual Studio 2015) on usb-connected "Surface 3"
Windows 10 Mobile Error: DEP6200
Please what can I do?
I had the same problem for a long time, but finally found a solution. Plug in your Lumia, go to Device Manager and uninstall it with drivers, then reboot. Everything should work fine. I know, I'm a bit late, but this answer might help someone else;)