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nrfutil generate zip can not work

Hi, Nordic

I download nRF5_SDK_12.1.0_0d23e2a\examples\dfu\bootloader_secure example, when I use dfu example via android nRF Toolbox, it can work.

Then I build nRF5_SDK_12.1.0_0d23e2a\examples\ble_peripheral\experimental_ble_app_buttonless_dfu, first use nrfutil to generage private.pem, then use nrfutil to generate zip, when I start to DFU, it can not work:

device log:

:INFO:PB: Init data len: 61

:INFO:Handling signed command

:INFO:Prevalidate FAILED!

:INFO:Sending Response: [0x4, 0xa]

android nRF Toolbox show "UNKNOW ERROR(8202).

maybe it is related to key, If I use bootloader_secure example, how can I generate my app dfu zip?

If I do not want to use secure, how can I do?

Thanks.

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