To install, as usually, download balenaetcher, flash a usb key with the donwloaded image, boot. The default login/password on dietpi are root/dietpi and for raspberry pi os pi/raspberry (take care to the default qwerty on raspberry pi os at boot). To configure keyboard, locales, timezone and wifi, do:
sudo dietpi-config
under dietpi and
sudo raspi-config
under raspberry pi.
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