NRF54L15 DFU The image does not have a valid mcu header

[bevis]

My steps:

1. Generate KEY using ed25519   py ../../bootloader/mcuboot/scripts/imgtool.py keygen -t ed25519 -k ./sysbuild/privateKey/private_key.pem
2. Compilation is complete, no errors, dfu_xxx.zip is generated
3. Placed on phone, used the latest version of nrf connect to load and send
4. Triggered APP error "Invalid file: The image does not have a valid mcu header"
   

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Tried efforts - all unsuccessful

1. Local environment encryption on computer? -- Changed to another computer
2. APP version too low? Does not support NRF54? -- Already the latest from the GitHub repository
3. Searched for answers on forums? -- No relevant issues found

[bevis]

Using v3.0.1, neither "Test and Confirm" nor "Confirm only" works