Sunday, August 9, 2015

Nokia Lumia 920 stuck with running gears at startup after hard reset because of a failed upgrade to Windows 10 preview with error code 8007020

I joined the Windows Insider program with my Lumia 920 to get a preview of Windows 10. The update failed to install with error code 8007020, same as described in this forum post:
http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_install/not-able-to-install-windows-10-on-nokia-lumia-920/6cd1e20b-bc41-437f-8626-6d7df503fe1a

I then tried to fix it with a hard reset, but then my phone was stuck with running gears at startup. Soft reset, another hard reset, waiting a couple of reboots, problem still was there.

The key combinations to be pressed for a soft and hard reset are described here under "FAQ - My Lumia stays at the spinning gears":
http://www.microsoft.com/en-us/mobile/support/faq/?action=singleTopic&topic=FA141347


How-I-fixed-it:

I fixed it by flashing the phone with the original Firmware using the Nokia Software Updater for Retail tool.

I found the solution in this Video:
https://www.youtube.com/watch?v=tVslVzUIDII

Here's the link to download the Nokia Software Updater for Retail :
http://www.softpedia.com/dyn-postdownload.php?p=141287&t=0&i=1

In case, the Software does not detect your phone via USB try:
Once the Software is waiting for the phone to connect, perform a soft reset (Press Volume down + Power until it reboots). This made it connect on my computer.

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