Hi @RayCali
Thank you for reaching out.
I think I have seen this error on elftosb before, but I have not seen an actual solution. Today elftosb is deprecated and not maintained. It was replaced by the nxpimage tool, which is part of our SPSDK.
Easiest way to use the NXP image is by using our MCUXpresso Secure Provisioning Tool. The GUI tool will autodetect the image start address and will create scripts that call the nxpimage, which does use your BD file.
Could you please try with the nxpimage instead?
Diego