Latest TCL 4K Fire TV (2023) user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 9; AFTMD001) AppleWebKit/537.36 (KHTML, like Gecko) Silk/122.2.2 like Chrome/122.0.6261.119 Safari/537.36	Mobile Silk 122	Fire OS 7
Mozilla/5.0 (Linux; Android 9; AFTMD001) AppleWebKit/537.36 (KHTML, like Gecko) Silk/120.2.3 like Chrome/120.0.6099.232 Safari/537.36	Mobile Silk 120	Fire OS 7
Mozilla/5.0 (Linux; Android 9; AFTMD001 Build/PS7708.5501N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/138.0.7204.168 Mobile Safari/537.36	Chrome Webview 138	Fire OS 7
Mozilla/5.0 (Linux; Android 9; AFTMD001 Build/PS7704.5024N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/136.0.7103.169 Mobile Safari/537.36	Chrome Webview 136	Fire OS 7
Mozilla/5.0 (Linux; Android 9; AFTMD001 Build/PS7699.4896N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/134.0.6998.135 Mobile Safari/537.36	Chrome Webview 134	Fire OS 7
Mozilla/5.0 (Linux; Android 9; AFTMD001 Build/PS7688.4592N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/128.0.6613.187 Mobile Safari/537.36	Chrome Webview 128	Fire OS 7
Mozilla/5.0 (Linux; Android 9; AFTMD001 Build/PS7685.4487N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/126.0.6478.186 Mobile Safari/537.36	Chrome Webview 126	Fire OS 7
Mozilla/5.0 (Linux; Android 9; AFTMD001 Build/PS7657.3645N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/108.0.5359.160 Mobile Safari/537.36 cordova-amazon-fireos/3.4.0 AmazonWebAppPlatform/3.4.0;2.0	Chrome Webview 108	Fire OS 7