[Windows 10 Mobile] nate0:
I have been getting a lot of questions regarding the Lumia 920 for North America (RM-820) as it pertains to upgrading to Windows 10 mobile. When I upgraded, I found converting it to a different variant (unbranding) was the easiest way for myself. Since removing the blog post I decided to post all the info and links here even if the steps are duplicated else where.

---##RM-820 from 2012

Upgrading a Nokia Lumia 920 to Windows 10 Mobile🙂#windowsphone #Lumia920 One of the greatest from 2012 is even better #nokia #lumia #Lumia920 #WindowsPhone

Tools/Items needed:

Windows Phone Internals 2.8 -- Downloads - Windows Phones Internals (wpinternals.net)

Custom ROM for the Lumia 920 -- Download link

OTC updater -- Download link thank you @trogper

Engineering Bootloader for the Lumia 920 (SBL3) -- Download link

Win10 Mobile (Semi-)Offline Update Project packages -- Download link

IUTOOL -- Download link

This is not an exhaustive step by step write up...meaning it is a high level order of steps to get the RM-820 to update to Windows 10 Mobile...

Use these tools and steps at your own risk! If you care about your mobile device or worry that you will do irreversible damage to it then don't do it or do. The choice is yours...

1. Install Windows Phone internals

2. Factory flash the RM-820 with the factory ffu (RM820_3051.50009.1425.2001_RETAIL_nam_usa_100_01_443332_prd_signed.ffu)for the RM-820 from Windows Phone Internals 2.8. You can download it directly from within Windows Phone Internals 2.8.

3. Once flashed boot the phone up set it up completely. Once setup unlock the bootloader using WinPhone Internals 2.8 following the steps needed.

4. Once unlocked flash the Custom ROM for the Lumia 920 link above...flashing all three partitions. This will convert your Lumia 920 (RM-820) into a RM-821.

5. Once flashing is complete, you can test it to see if all functions normally. If it does you can either leave it this way or go further. I had to go further because I had issues updating to newer Windows 10 Mobile builds, and my keyboard was broken.

6. To get further updates on the Windows 10 mobile builds we are going to rollback the Phone to Windows Phone 8.1 using the RM-821 FFU. Flash it using Windows Phone Internals 8.1 (RM821_3051.50009.1451.1_RETAIL_eu_euro2_248_01_476635_prd_signed.ffu). Found here

Phone model: Lumia 920

PackageTitle: RM-821 VAR EURO2 DE CV GREY

Product Code: 059S250

manufacturerHardwareModel: RM-821

Last Firmware: 3051.50009.1451.1001

View attachment 5556553

7. Once flashed boot the phone and set it up completely. Check to make sure it has Windows Phone 8.1 version 8.10.14219.341 or higher. If not check for updates over wifi.

You will not succeed the next step unless the Lumia 920 has Windows Phone 8 version 8.10.14219.341 or higher.

8. Extract 768x1280 folder from Win10 Mobile (Semi-)Offline Update Project packages (win10_mobile_offline_updater_v41.wim). Using iutool send the packages from the 768x1280 folder to the Lumia 920. Let if complete and update to Windows 10 Mobile.

After it boots set it up. Get to the home screen. Do not let it update and do not send any updates to it.

9. Unlock the bootloader of the Lumia 920 using Windows Phone Internals 2.8 but this time also send the SBL3 bootloader image link above.

This will allow you to unlock the bootloader with Mass storage enabled.

10. Once you are able to access the device using Mass Storage navigate to the drive of the phone (in my case it was E:\. Once there navigate to Windows\System32\Config. Here are the registry hives. Load the hive system using your registry editor on your PC. Once loaded navigate to the tree below:

Lumia920hiveSystem --> Platform --> DeviceTargetingInfo

In this registry key you will find many values. Change the following values to match those of a Lumia 950 XL US model.

PhoneManufacturerModelName change it to RM-1085_126279. Next change PhoneModelName from Lumia 920 to Lumia 950 XL. Then edit PhoneHardwareVariant and change it to RM-1085.

After complete, you can double check that the changes are valid. Then unload the Lumia 920 registry hive that you mounted. Once unloaded you can boot the phone up if you need one last time but do not update it since the bootloader is unlocked.

11. Next relock the boot loader using Windows Phone Internals 2.8

Once locked boot the phone up completely to the start screen.

12. Now connect the phone with cable and use the OTC Updater to update to any further Windows 10 Mobile build you want. Once you feel like you are on a build that you want to use you can factory reset the phone to reset the Registry changes in the OS, this will force it to stay on that OS build since the Lumia 920 does not have any production OS builds created for it further that the TH2 updates...

Alternatively you can let it download the updates over wifi but sometimes that can be time consuming.