WP8548 flashing spk without legato

Hello, I compile sierra yocto system without legato, and I wanna to write it on device. I’m using mangoH green as devkit.
I try to made spk by swicwe

swicwe --output my_image.spk --cat swi9x15y_07.11.22.00_00_generic_001.032_000.spk boot-yocto_wp85.cwe mcufw_001.011.cwe

But I can’t flash device. I tried to use swiflash, but device stuck on downloading, or didn’t rebooting after downloading. I successfully could flash downloaded spk from site with legato, but I need system without it. Could someone help me with that? Mb some could gave spk image without legato with minimal yocto build?