NanoPi NEO2 - Device disappears after initial boot & update

I am able to successfully login and begin the initial update process 147->150, but following the mandatory restart the device is no longer accessible at that IP and is no longer in my DHCP table.

Have tried on both a 8GB and 32GB sd card with the same result.

Writing this image: DietPi_v147_NanoPiNEO2-arm64-(Jessie).img

Not seeing any errors in the update and w/o video out I’m a bit stuck. Thanks in advance.

Insufficient PSU.

Apologies.