Latest Purism Librem 5 user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Librem 5, like iPhone; X11; Linux x86_64) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 Safari/605.1.15 Epiphany/605.1.15	GNOME Web 605	PureOS
Mozilla/5.0 (Librem 5, like iPhone; Linux aarch64) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0 Chrome/64 Mobile/15E148 Safari/605.1.15	Chrome Webview 64	PureOS