How to reset board to default state?

[kkdao]

I have a Rockpro64 board in which I flashed an Ubuntu OS via an eMMC and installed a system onto it. However, I messed something up during the install and would like to completely start from scratch. There is nothing important on the drive I have attached to the board like this setup here, expect I have an NVMe M.2 SSD: https://notmandatory.org/rockpro64-pt1/

So I would like to unmount the drive, reformat and redo the LVM volumes I had setup, and do anything else necessary to go back to default configuration settings so I can start from scratch trying to install that system again.

Any tips or pointers would be greatly appreciated!

All data/settings are on the emmc chip, you just need to reflash it and it will be back to defaults...

I hoped that would be the case, but when I tried to re-install the system above again before, I would get systemd.service 'depenedency' errors relating to the mount point