OpenWrt pogoplug v3 pro upgrade not working 22.03.3 -> 22.03.5

Trying to upgrade by using the upgrade link from

I use this in the while I ssh in the pogoplug:

cd tmp
sysupgrade -c -o -v -k openwrt-22.03.5-oxnas-ox820-cloudengines_pogoplugpro-squashfs-sysupgrade.tar

I get:

Mon Apr  3 10:43:25 UTC 2023 upgrade: Commencing upgrade. Closing all shell sessions.
Command failed: Connection failed

Machine is pingable for 1 min goes down for few mins comes back up, and is still running 22.03.3

Tried this several times, and also using the lucy upgrade, but the results is the same.

How can i tell what goes on and why the upgrade fails?

I was able to upgrade by booting from u-boot using tftpboot, and then running sysupdgrade as described here:

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