Configuring a Lumia for Flight Signing

In this article we will discuss how to configure a Lumia for Flight Signing.

As of 2017, the old Windows Insider application has been shut down, and thus hacks are required to enable Flight Signing on devices.

Preparations

• WPinternals must be installed on the target computer with the resources to unlock the phone bootloader prepared.
• OSFMount must be downloaded in order to modify a partition.
• A copy of the SbcpFlightToken.p7b must be downloaded.

Bootloader Spec A

Primary method (Easiest)

• Unlock the device using WPinternals.
• Go to mass storage mode
• Paste the token file into EFIESP\efi\Microsoft\Boot\policies\
• Reboot the phone

Alternative method to not cause issues with delta packages (CBSU/SPKU)

If you do not want interferences with updates caused by a patched mobilestartup.efi file, you can proceed to the following:

• Unlock the device using WPinternals.
• Go to the dump section of WPinternals, select the path to your device FFU file.
• Select a destination path for the EFIESP partition.
• Dump
• Mount the EFIESP.bin file you just dumped via WPinternals via OSFMount (make sure you disable read only and use Direct writing mode)
• Paste the token file into EFIESP\efi\Microsoft\Boot\policies\
• Unmount EFIESP.bin via OSFMount
• Go to the flash section of WPinternals
• Scroll down to the flash partition manually area
• Select your modified EFIESP.bin file
• Flash
• Reboot the phone

Bootloader Spec B

• Go to the dump section of WPinternals, select the path to your device FFU file.
• Select a destination path for the EFIESP partition.
• Dump
• Mount the EFIESP.bin file you just dumped via WPinternals via OSFMount (make sure you disable read only and use Direct writing mode)
• Paste the token file into EFIESP\efi\Microsoft\Boot\policies\
• Unmount EFIESP.bin via OSFMount
• Go to the flash section of WPinternals
• Scroll down to the flash partition manually area
• Select your modified EFIESP.bin file
• Flash
• Reboot the phone