Hi Eduardo,
Sorry about the delayed response. I was able to update the NBU as per the documentation and the code crash stopped.
However, I still cannot get any BLE examples to work at the moment. I am not sure what the error is at present, but the BLE does not show up on the Apps that can be used for testing e.g NRF Connect etc
I will go throug the documentation to understand things further.
Thanks for your quick support.