Hi everyone
A bit of a PSA, if you have a new Apple device with the M1 chip do not erase the HDD until you have updated it to Mac OS 11.0.1 otherwise you risk bricking the device
https://support.apple.com/en-us/HT211983
I've fallen into this trap and so far have a device that is no more use than a doorstop, I've followed both "solutions" and neither have worked for me.