KW47 NBU programming and upgrade

[wjw2026]

Hi:

I want to know how to programming and upgrade of KW47 NBU.I hope the steps can be more detailed. 

Thank you!

[sofiaurueta]

Hello, hope you are doing well.

You can refer to AN14796 Migration Guide from the KW45 to the KW47, section 6.2 "Load NBU firmware in KW47".

In this document you will find several methods to update the NBU for KW47 (the steps are demonstrated using the KW47-EVK), including blhost, the Secure Provisioning Tool and LinkServer, you can use whichever approach works best for your development. The detailed steps for each method are included as well.

Hope this helps! If you have any further question, please let me know.

Best regards,
Ana Sofia.

[wjw2026]

Hi:

Thank you very much for your support. I can now update the nbu firmware through the method you provided. 

I see that the method you provided doesn't include the way to update nbu through firmware?  For instance, if my device is launched on the market and I need to update the nbu version, how should I proceed? 

Thank you!

[sofiaurueta]

Hello,

The ROM Bootloader has a firmware update feature that can be used for updating main flash as well as radio flash firmware.

For in-field NBU updates, the workflow typically follows this sequence: the application stores the update image and writes the corresponding metadata into the User IFR0 OTACFG region, then triggers a system reset so the ROM bootloader can take over and perform the radio firmware update.

More information is available in the KW47 Security Reference Manual sections 4.2.6 “Firmware update feature” and 4.2.2.3 Over-the-air (OTA) update configuration.

Best regards,
Ana Sofia.