Unable to open initramfs

[NiKiZe]

(2019-05-10 08:38)daferret Wrote:  set default_uut_os ${mfg_data}/uut-os/default
kernel ${default_uut_os}/vmlinuz console=ttyS0,11520 fastboot initrd=${default_uut_os}/initramfs.gz mfg_setup=${mfg_releases}/mfg/default/admin/uut_os/setup-after-boot.sh
initrd ${default_uut_os}/initramfs.gz

You need to differ between initrd to download the file which can use full path to find it.
When it is downloaded however there is no path information, this can be seen by using imgstat.

what you need is to change your kernel line to only have
initrd=initramfs.gz
that is without the ${default_uut_os}/ part