HOW TO - Raspberry Pi3 boot from SSD - Install openHAB to USB or SSD and boot

[Jostein89 (Jostein)]

Have you upgraded the boot loader to the latest: https://www.raspberrypi.org/documentation/hardware/raspberrypi/booteeprom.md

I had to add to .config as shown on the link below:

Raspberry Pi 4 USB Boot Config Guide for SSD / Flash Drives