Latest KDDI J Butterfly user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 7.1.2; HTL21) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.105 Mobile Safari/537.36	Chrome Mobile 89	Android 7
Mozilla/5.0 (Linux; Android 4.1.1; HTL21 Build/JRO03C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Mobile Safari/537.36	Chrome Mobile 67	Android 4
Mozilla/5.0 (Linux; Android 4.1.1; HTL21 Build/JRO03C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.33 Mobile Safari/537.36	Chrome Mobile 58	Android 4
Mozilla/5.0 (Linux; Android 4.1.1; HTL21 Build/JRO03C) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.84 Mobile Safari/537.36	Chrome Mobile 45	Android 4