[Windows 10 Mobile] hikari_calyx:
FAQ​

Bypass Reset Protection​

If you forgot or were unable to disable Reset Protection before you downgrade, you'll be asked to provide Reset Protection Key which seems unable to obtain nowadays.

In this case, we must bypass it.

To do that:

1. Skip Internet connection at Setup Wizard.

2. When it asks for Reset Protection Key, choose "Disable using recovery Key".

3. Wait 10 minutes at this screen (important). You can turn off the screen and connect to a charger while waiting.

4. Tap on the first text box to get keyboard, then press and hold "&123" and choose the cog button to enter Keyboard settings.

5. Tap on the cog icon on left top corner to enter System Settings. (If you can't enter then it means you didn't wait 10 minutes).

Then connect to Internet. If you accidentally close System Settings and return to Reset Protection Key screen, repeat step 4 and 5.

6. Enter Update & Security - For developers, and turn on following options:

* Developer mode

* Device Discovery

* Device Portal

and turn off the Authentication.

7. Use the PC connected to same Wi-Fi to browse to the website shown on your phone's screen - for example your device could be

https://192.168.10.225

8. Download Interop Tools 1.9.400 and it's dependencies here:

Interop Tools - A versatile registry app for all devices, now on Github

IMPORTANT ANNOUNCEMENT (11/25/2017): https://xdaforums.com/showpost.php?p=74628972&postcount=1071 IMPORTANT ANNOUNCEMENT (08/02/2020): https://xdaforums.com/showpost.php?p=83193721&postcount=1236 Source code...

xdaforums.com

9. Click "Apps" on left panel.

10. In App Package section, select the dependency files inside of Dependencies_ARM folder and install them one by one. Once these 5 dependencies are installed, install Interop Tools appxbundle.

11. Make sure the screen of your phone is turned on. Select "Interop Tools (RC)" in Installed apps list, and click Start.

12. Interop Tools will run on your phone. Tap "THIS DEVICE".

13. Choose "Applications" on left hamburger menu.

14. Swipe to "Package List" section.

15. Wait for the package list being fully initialized. Once initialized, search "wizard" in "Search a package" text box.

16. Choose the first "Setup wizard" in list.

17. Then choose "Launch App" and finish setup wizard. Once setup wizard finishes the phone will return back to Interop Tools.

18. Reboot your phone manually. Now you have successfully bypassed Reset Protection, although it's not completely removed from phone, it doesn't affect the final result of installing Android.

Install Google USB Driver​

First of all, don't use Minimal ADB and Fastboot - always use this:

SDK Platform Tools release notes | Android Studio | Android Developers

Android SDK Platform-Tools is a component for the Android SDK.

developer.android.com

You can download the Google USB Driver from here:

Get the Google USB Driver | Android Studio | Android Developers

The Google USB Driver is required to perform adb debugging on Windows with Google devices.

developer.android.com

When phone connected to PC under fastboot mode, right click on "Android" in Device Manager, choose "Update Driver".

Choose "Browse my computer for drivers" - "Let me pick from a list of available drivers on my computer" - "All devices" - "Next" - "Load from disk", then browse to any inf file you extracted from Google USB Driver. Then, select "Android Bootloader Interface" from the list and confirm installation.

Now your phone should be detected by fastboot properly.

What if I used old method to install Android and unable to boot into OS?​

You can straightly unlock the bootloader and flash system partition manually.

Any possibilties of bringing Android to other Windows Phone models?​

No.