Failed to verify required signature 'key-customer'

Hello, I am using Hummingboard IIOT and generated image using bitbake as given in GitHub - SolidRun/meta-solidrun-arm-hailo: A yocto meta layer for SolidRun Hailo-15 SOM. Then i uploaded uart flashing firmware and system and reflashed QSPI content. But when i loaded u-boot-tfa.itb in the SOM it shows the following error evenif the uboot menu can be accessed. So it is prohibiting to flash eMMC content.

Loading kernel from FIT Image at 85000000 …

Using ‘conf-hailo_hailo15-solidrun.dtb’ configuration
Verifying Hash Integrity … sha256,rsa3072:customer- error!
Verification failed for ‘’ hash node in 'conf-hailo_hailo15-solidrun.dtb’e
Failed to verify required signature ‘key-customer’
Bad Data Hash
ERROR: can’t get kernel image!
hailo15#

So how can fix this issue?