Can't deploy project in visual 2012 pro with device lumia 520 - windows-phone-8

I have a problem , I can't fix this.
I deploy project with device (lumia 520) , but visual push notification: windows phone 8 phone was detected. But , my phone is really plug in my computer , and i can access phone's folder.
My phone didn't lockscreen.
Phone's driver has installed.
You can see in the picture:
http://i.upanh.com/rchnbi
I was restarted my phone for 10 times , but it's still connected.
Help me resolve this problem , thanks

Have you ever tried to deploy your app to an Windows Phone Emulator?
If your app succesfully deploying to Emulator, I can say your connection of your phone is having problem. But, if you can not deploy your app neither phone nor emulator, it could be about VS2012 or SDK.
So, I sugges you to remove your phone from your computer (Open Device Manager and remove your app (dont forget to unplug it). And then reconnect your phone again.
So, try these and please tell me the results. I was had some problems like yours.
And also, maybe you can check your device's registration status (developer registration) If yes, please try unregister and register it againg for development (http://prntscr.com/2fehv1)

Do a soft reset to your device and restart VS2012 again to solve this problem. (To do this: press and hold the power button and volume down button for about 10 seconds)

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Windows phone - You have installed the maximum number of development app

I have a windows app that's running for a while and recently when I'm trying to deploy the application on windows phone running windows 8.1 OS(using visual studio 2013 and windows phone application deployment) I'm getting the following error:
"You have installed the maximum number of development apps. These apps are installed to your device when you start them in Visual Studio or when you use the App Deployment Tool. Please uninstall one of them and then try again."
I've tried to reset the phone, renaming the app and the phone on windows explorer, unregister & register the phone and also uninstalling all the other applications on it.
The problem is happening on two different devices Nokia Lumia 630 & Nokia Lumia 920.
Is there another way to approach this?
Thanks in advance
This issue has been fix now and we can register our Windows Phone 8.1 for developing:
Could you please try to unregister the Phone from the Dev Center and register Phone again to see if it works?

Windows Phone 8.1 device registration error code 0x64

I wanted to get started with app development for windows phone 8.1. I own an up-to-date Lumia 630 device with Windows Phone 8.1 which I wanted to use as test device. Now, the problem is that i can't register this device as a test device. The registration tool which came with the sdk 8.1 always give me the 0x64 error code. I googled this problem but none of the solutions (including the ones here on stackoverflow) solved the problem for me. My phone has internet connection through wi-fi and is unlocked and up-to-date (tryed restarting and not using wi-fi). Also the windows background service is running (also tryed restarting it). An up-to-date windows 10 is running on the laptop with which I want to develop.
My microsoft account is not a developer account but from my understanding, i should still be able to use at least one device as test device without having to pay.
I also posted this question in the microsoft forum.
I appreciate any help.
I think your account must be associated with dev account.
Not sure what changed, but it appears this is now fixed. I am able to register multiple devices to my developer account again.

Windows phone 8.1 universal app create .appx file but not work in nokia lumia 720 device

I am developing windows phone application. I am having problem on deploying my project.
Error -Deployment failed because no windows phone was detected. Make sure a phone is connected and powered on. But my phone already detected and power also ON . i have register my windows phone for developer register account.
See: https://www.dropbox.com/s/ftx35jzp0p8s7xi/Error.png?dl=0
Thank you .. :)
For some the issue was resolved by following the below:
Disconnected the Phone from the USB. Then went to 'Control Panel->Hardware and Sound->Devices' and Removed Device. Then connected the Phone to the USB.

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I finally figured it out. I went to device manager and found under Universal Serial Bus Devices and found device drivers of my phone on all the ports where I had connected the USB cable. I then right-clicked on one that showed that needed an update. I clicked on update device driver software where it scanned for updates and found out that the driver was up to date then I realized that it was not enabled. I enabled it and it was able to recognize the phone. However I had to keep restarting the service since the software kept going offline as well as switching from 3G to Wi-Fi. And it finally worked :)

Deployment failed or Emulator is not start

I am using Windows phone 8 sdk and Visual studio 2012
deployment failed because no Windows phone 8 was detected.
Make sure a phone is connected and power is on
Tell me how can I resolve that error.
It would seem that you need to make sure that the OS thinks that the device is connected.
I've had this a few times and addressed it with the following:
- unplug and then reconnect the device
- Try a different cable
- You may also see this if you have a very low battery charge
To confirm that the OS thinks the phone is connected, make sure you can see it in Windows Explorer or the Windows Phone [app for desktop] application.
I had the same problem - the phone just stopped connecting. Turn it off completely (hold on power button and then slide down) and turn on again - Windows will notice it and you will see it in Windows Explorer under "Devices and drivers" section.