Troubleshooting • Re: Pi zero cluster error

I have a pi zero cluster that works just fine, however it recently started displaying this error:

Failed to load HAT overlay
dterror not a valid FDT - error 9

I have installed all updates. Does anyone have any ideas what's causing this & how to fix it?

Are you using some sort of cluster hat with Pi Zero computers on top?

https://clusterhat.com/

I'm still running an old version of Raspberry Pi OS on my Zero cluster. I didn't use a hat to make it but just a regular USB hub.

Statistics: Posted by ejolson — Mon Feb 16, 2026 3:15 am

---