Dears,
What should I do to for this problem.Thanks.

Dears,
What should I do to for this problem.Thanks.

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