User manual Bang & Olufsen BeoPlay A9 (English - 17 pages)
Beoplay A9 1st Gen – Bang & Olufsen Support
Amazon.com: Bang & Olufsen Beosound A9 (5th Generation) - Iconic and Powerful Multiroom WiFi and Bluetooth Home Speaker with Active Room Compensation, Black Anthracite : Electronics
How do I reset Beoplay A9 1st Gen to factory settings? – Bang & Olufsen Support