Yes my install is on ZFS, I can't currently check the boot issue due to not having physical access. I usually configure everything over wireguard but everything I have mentioned since the connection issue has been done on a video call with people who do have physical access, they're not the most technical and plugging a mouse and keyboard in etc to check the bios is out of scope. It is ridiculous I know but my options are limited at the moment. I do have the ISP router ready to go as a backup if this can't be fixed remotely
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