Wireless MCUのトピックKW47B42ZB7 Fuse write issue

KW47B42ZB7 Fuse write issue

Lu888 — Wed, 09 Sep 2026 03:49:07 GMT

Lu888_0-1788925610415.png

As shown, I cannot write to fuse 0xa, but I have successfully written to fuse 0x1f. I don't know why

Re: KW47B42ZB7 Fuse write issue

Christine_Li — Wed, 09 Sep 2026 09:05:57 GMT

Hi, @Lu888

Thanks for creating case to us.

From your provided info, I think you can execute fuse-read command means you are not in "After OEM Open" state.

But according to:

KW47SRM.pdf

The reason is:

The RO in the following table indicates that user cannot use MGMT_FUSE_PROGRAM to write the lifecycle fuses, instead, he can use MGMT_ADVANCE_LIFECYCLE or MGMT_SET_RETURN_FA_MODE.

Christine_Li_0-1788944686191.png

If you want to change lifecycle, you can use this command: MGMT_ADVANCE_LIFECYCLE in SB3 file.

Christine_Li_1-1788944712390.png

Best regards,

Christine.

Re: KW47B42ZB7 Fuse write issue

Lu888 — Thu, 10 Sep 2026 08:48:52 GMT

Hi @Christine_Li ,

Does it mean that the fuse-program command of blhost cannot be used to program the lifecycle in kw47？

Re: KW47B42ZB7 Fuse write issue

Christine_Li — Fri, 11 Sep 2026 06:58:46 GMT

Hi, @Lu888

Can you please help to check what is your board's lifecycle currently?

You can use below command on your board which already been executed previous commands:

Christine_Li_0-1789109774271.png

blhost -p com4 fuse-read 0xa 4

I want to know whether your board already been changed into OEM-Closed.

Because I found that according to this AN： KW47 Managing Lifecycles

you are using correct commands to change lifecycle. Which is conflict with my previous comment.

Best regards,

Christine.