bootloader version required with bootloader image

[ArchieL]

Dears,

What should I do to for this problem.Thanks.

[Karl Ylvisaker]

Hello ArchieL,

The error message reads: 

Error: --bootloader-version required with bootloader image

It seems to me that you did not pass the --bootloader-version argument as part of the nrfutil command.
Please try to add this argument, and see if it resolves you issue.

Best regards,
Karl