Testing SecureBoot signature failure

Hello - I am evaluating secureboot on the nrf9160. I have followed your very-good secure immutable bootloader example - and I can see from the serial output the image is verified successfully.  I have tried next to verify the output of a failure to test that the signature check is working properly, but when I try and flash an unsigned image through nrf connect it seems my only option is to erase the whole chip (which gets rid of the bootloader, I think?) 

What is the easiest way I can test the rejection of an improperly signed application image after going through the Secure Immutable Bootloader example?

Thank you,
timo

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