Developer unlock Windows Phone 8 : Error Code 0x64

Question

We need to unlock a Windows Phone 8 device in order to deploy our app that still supports this specific platform.
The process was working some months ago without any problem but now, Windows Phone Developer Registration Tool, available with SDK 8.0, returns the following error:

We have already tried with different devices (with the date set correctly: UTC +1 Rome)

• HTC 8S
• Lumia 720
• Nokia 625

all with the same result. We have tried to unlock our devices for an entire week, so it does not seem a temporary problem.

The devices and the pc have both a working Internet Connection and aren't running behind any firewall/proxy at all.

We have no problem at all, unlocking WP 8.1 devices with the proper Windows Phone Developer Registration Tool for WP 8.1

Do you know if there's any technical problem on the Microsoft side?
Is the Windows Phone WP 8.0 unlocking process still supported by Microsoft?

Answer 1

As of May 13, 2015, you can no longer developer unlock Windows Phone 8.0 devices. You have to upgrade them to Windows Phone 8.1. I don't have an article to point to, just an email I received from MS to the email address associated with my developer account:

If you have a Windows Phone 8.0 device that you use to test your apps, please read this mail.

The Windows Phone 8.0 certificate that validates developer unlocks will expire today May 13, 7pm, Pacific Daylight time.

We recommend that you re-unlock your Windows Phone 8.0 test devices prior to today 7pm, to continue testing for another 24 months.

After today, no Windows Phone 8.0 device will be able to be developer unlocked, and you will have three options to continue testing Windows Phone 8.0 packages: – Update the phone to Windows Phone 8.1 and unlock it for developer testing – Submit apps as beta through the Windows Dev Center and test with Windows Phone 8.0 devices – Test Windows Phone 8.0 apps via the Windows Phone emulator

Any Windows Phone 8.0 device currently unlocked will continue to be unlocked and work as a test device until its certificate expires. To maximize the time available to test with this device, please lock then unlock the device before May 13, 2015 7pm PDT.

Note that this change has no impact on apps available in the Windows Phone Store, has no impact on Windows Phone 8.1 devices, nor will it impact customers with Windows Phone 8.x devices.

The Windows Store team

Answer 2

I tried registering my Lumia 820 using WP8 SDK Registration tool and it succeeded. So I believe there is no technical problem on Microsoft's server.

It is still possible to unlock Windows phone 8.0 devices. Only 7.x devices can't be unlocked now as mentioned in this article

As you are getting time error, Try disabling "Set Time automatically" from Settings menu as per the official documentation

Are the date and time set correctly on the phone? In SETTINGS | date + time, turn off the Set automatically setting and then retry registration. After registration succeeds, turn this setting on again.

Answer 3

Make sure your phone also has some internet connection, such as wifi.

Answer 4

I've had some problems sometimes registering some WP devices as developer devices. I've never had this particular error, but maybe this will work.

When the device is connected to the computer, in the taskbar click in the icon which shows that a device is connected (the one where you can "Safely remove" the device) and right click on it and select the show devices and printers option. When it opens, you will see all the windows phone devices you have connected to the computer. Disconnect your device and uninstall it and its drivers by selecting the appropriate option after right clicking on it.

Connect it again, it should now install its drivers again.

And just in case, if you have the correct date/time on the device, just confirm they also match the region/location set in the device. for eg- suppose you have set the time to indian standard time (IST) but the region of the device is set to that of USA or some other location.