How to force dev unlock of Windows Phone 8 device?
Surprisingly, after May 14, 2015 Microsoft has said that Windows Phone 8 devices will no longer be developer unlocked due to MS security certificates expiring. This date has obviously come and gone, nonetheless here I am with an HTC Windows Phone 8S, a phone that won't receive 8.1 update but in need of some developer testing. Does anyone know of a way around this to developer unlock a phone? I've tried changing the date back to pre-May 14, however, this does not work.
You can't unlock it as a Windows Phone 8.0 device, but you can upgrade it to Windows Phone 8.1 through the Windows Phone Developer Preview and then developer unlock it.
While early versions of the Windows Phone 8.1 preview did not support the 8s, the update has been available for that device since September (see http://blogs.windows.com/bloggingwindows/2014/09/24/new-update-for-windows-phone-preview-for-developers/ )