Install Windows 10 ARM to the Lumia

Expand Windows 10 ARM to the phone.

Use 7-Zip or any tool to extract the Windows 10 ARM file downloaded.
Navigate to the folder which you extracted the files to. Go to Sources. Click on the address bar, copy the text inside.

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Now, open Command prompt as Administrator. Type:

cd "<CopiedText>"
%Windir%\System32\dism /Apply-Image /ImageFile:".\install.wim" /Index:1 /ApplyDir:"<Windows10Volume>:\"

Where <CopiedText> is the text copied in the previous step. <Windows10Volume> is the drive letter of the Windows 10 ARM partition created in the previous part.

For example:

cd "C:\Users\HomePC\Downloads\10.0.15035.0.armfre.rs2_release.170209-1535\sources"
%Windir%\System32\dism /Apply-Image /ImageFile:".\install.wim" /Index:1 /ApplyDir:"F:\"

Press enter. Wait for the command to complete. If nothing went wrong, the command will write The operation completed successfully.

Tip: Disable Windows Defender to speed up the process.

Install the drivers

Download the drivers

Extract WFAv7 Driver Downloader (aka. master.zip). Go to the folder with extracted files. Open Driver Downloader.
Select the device you wish to install (use the keyboard). Wait for the drivers to be downloaded.

• If the download fails, your Antivirus/Firewall or your internet might be blocking it.

Install the drivers

Navigate to Drivers folder, then LumiaXXX depends on the Lumia model you are using.
Click on the address bar, copy the text inside. (like you did previously)

Open Command prompt as Administrator. Type:

cd "<CopiedText>"
dism /Image:"<Windows10Volume>:\" /Add-Driver /Driver:".\" /Recurse

Where <CopiedText> is the text copied in the previous step. <Windows10Volume> is the drive letter of the Windows 10 ARM partition.

For example:

cd "C:\Users\HomePC\Downloads\master\Drivers\Lumia930"
dism /Image:"F:\" /Add-Driver /Driver:".\" /Recurse

Press enter and wait for the command to complete. If nothing went wrong, the command will write The operation completed successfully.

At this point, you are ready to move on to the next part.

The next part: Configure Windows Boot Manager