Ext4 sysupgrade help

Hello all,

I have a CM4 on a wondershare 4g/5g board, with a 19.xx.xx something snapshot build currently and I am trying to upgrade to a 22.xx.xx build.

When I issue any of the below commands:

sysupgrade -n /tmp/RaspberryPi-CM4-ext4.img

sysupgrade -F /tmp/RaspberryPi-CM4-ext4.img

I get this error:

Cannot find '/overlay/upper/etc', required for '-c'

This mounted on a 30' pole, so I am hoping there is a way for me not to have to climb it.