Finally! Raspberry PI 4 boot from SSD, no MicroSD required!

[Jpsy (Jörg Wagner)]

A community guide answering many topics of this thread:

Installing Home Assistant on a RPi 4b with SSD boot

[UPDATE 2020-10-14 by @Jpsy ]: Added instructions to update HA OS through CLI. [UPDATE 2020-10-18 by @Jpsy ]: More details added on installing and using Raspberry OS to update the EEPROM firmware. [UPDATE 2020-10-20 by @Jpsy ]: Infos added on using Raspberry OS “headless” through SSH (no monitor or keyboard attached). Thanks to @LondonBenji for these details. [UPDATE 2020-10-22 by @Jpsy ]: Infos added on working (and non-working) SATA to USB3 adaptors. Some infos about Sabrent adaptor r…