How to replace kernel Image and dtb

I want to replace kernel Image and dtb with customer , when I replace boot/Image , board isn’t setup with this log :

[0009.151] I> Continuing with default option: 1
[0009.151] I> Loading kernel sig file from rootfs …
[0009.151] I> rootfs path: /sdmmc_user/boot/Image.sig
[0009.170] I> Loading kernel binary from rootfs …
[0009.170] I> rootfs path: /sdmmc_user/boot/Image
[0009.713] I> Validate kernel …
[0009.714] I> T19x: Authenticate kernel (bin_type: 37), max size 0x5000000
[0010.027] E> digest on binary did not match!!
[0010.027] C> OEM authentication of kernel payload failed!
[0010.028] W> Failed to validate kernel binary (err=1077936152, fail=0)
[0010.028] W> Security fuse not burned, ignore validation failure
[0010.035] I> No kernel-dtb binary path
[0010.036] W> No valid slot number is found in scratch register