Make sure you have a good & reliable SD card and a proper power supply. Archives can be flashed with Etcher (all OS) directly.

Insert the SD card into the slot, connect a cable to your network if possible or a display and power your board. (First) boot (with DHCP) takes a bit longer.

Specifications

* Specifications differ from hardware revision, model and software support level

Archived versions(use archived builds in case current doesn't boot)