I’ve Windows Mobile Phone Lumia 520 and it’s been into unusable state while trying to update the latest version of Windows 10 for Mobile Phone 10052 (10.0.12534.59). The mobile phone was getting restarting to the setup screen again and again. The Windows 10 was not loading! More details about the latest version of Windows 10 for Mobile Phone is posted Download and Update Next Version Windows 10 for Mobile Phones with Bug Fixes. Tried reset the “unresponsive Windows Mobile phone” using following method without any luck.
Press and hold the Volume down and Power buttons at the same time until you feel a vibration (about 10-15 seconds).
When you feel the vibration, immediately press and hold the Volume down button until you see a large exclamation mark.
Once the exclamation mark appears, press the following four buttons in this order: Volume up , Volume down , Power , Volume down . Your phone should now reset and restart itself. (It might take a while for the reset to finish.)
The reset option didn’t help to get Lumia 520 phone back to normal. The next option is to try “Windows Mobile Phone Recovery Tool” to get back to the original version (Windows Phone 8.1) of OS in the mobile. Try to download the latest version Windows Phone Recovery Tool 1.2.4 from here. Install the Windows 10 mobile recovery application on to your laptop. Installation is just 2 clicks and done. Launch Windows mobile recovery tool from your Windows laptop or desktop.
Connected the Windows Mobile Phone Lumia 520 to the laptop using standard USB cable. When your phone is ok and working fine then you would be able find the following screen. In my case that was not the case. Windows mobile phone recovery tool was not able to find the Firmware Version and Operating system version of Lumia 520.
The Windows Phone recovery tool 1.2.4 couldn’t able to find the latest Operating System in my laptop hence it started downloading Operating System version 9651.14234 from the nearest server. The size of the Windows Phone OS was 1.24 GB.
After the download of latest version of Windows Mobile Phone OS to laptop, it automatically started the installation of Windows Mobile OS 8.1 on Lumia 520.
At the same time, you can notice that the Windows Phone (Lumia 520) started installing the OS. You would be able to see following screen in the phone. Make sure the battery is more than 25% on your phone otherwise the Windows Phone recovery tool will give you a warning.
The Windows mobile phone recovery completed within 30 minutes and Lumia phone was ready to use !!
As you can see in Windows Mobile Phone recovery tool that Firmware version and Operating System version are same on both phone and Software available server. There is also an option to re-install operating system software on your phone as you can see in the following picture!!