Latest Amazon Fire HD 8 (2022) user agents:

User Agent	Browser	Platform
Mozilla/5.0 (Linux; Android 11; KFRAWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.219 Safari/537.36	Chrome Webview 146	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/150.1.168 like Chrome/150.0.7871.181 Safari/537.36	Mobile Silk 150	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAPWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.219 Mobile Safari/537.36	Chrome Webview 146	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAPWI Build/RS8338.3339N) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/150.0.7871.94 Safari/537.36 [FB_IAB/FB4A;FBAV/569.0.0.42.72;IABMV/1;]	Facebook 569	Fire OS 8
Instagram 437.0.0.33.78 Android (30/11; 248dpi; 800x1280; Amazon; KFRAPWI; raspite; mt8169; en_US; 1011909405)	Instagram 437	Fire OS
[FBAN/FB4A;FBAV/566.0.0.48.73;FBBV/997672821;FBDM/{density=1.3312501,width=800,height=1216};FBLC/en_US;FBRV/1004976191;FBCR/;FBMF/Amazon;FBBD/Amazon;FBPN/com.facebook.katana;FBDV/KFRAPWI;FBSV/11;FBOP/1;FBCA/arm64-v8a:;]	Facebook 566	Android 11
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.4.3 like Chrome/148.0.7778.265 Safari/537.36	Mobile Silk 148	Fire OS 8
[FBAN/FB4A;FBAV/566.0.0.48.73;FBBV/997672821;FBDM/{density=1.3312501,width=800,height=1216};FBLC/en_GB;FBRV/1003448157;FBCR/;FBMF/Amazon;FBBD/Amazon;FBPN/com.facebook.katana;FBDV/KFRAWI;FBSV/11;FBOP/1;FBCA/arm64-v8a:;]	Facebook 566	Android 11
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.7778.265 Safari/537.36	Chrome 148	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAWI Build/RS8338.3339N) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/149.0.7827.150 Mobile Safari/537.36 [FB_IAB/FB4A;FBAV/566.0.0.48.73;IABMV/1;]	Facebook 566	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/146.4.10 like Chrome/146.0.7680.224 Safari/537.36	Mobile Silk 146	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; KFRAWI Build/RS8338.3339N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; KFRAPWI Build/RS8338.3339N)	Android Browser	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.219 Mobile Safari/537.36	Chrome Webview 146	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.4.3 like Chrome/148.0.7778.265 Safari/537.36	Mobile Silk 148	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.3.5 like Chrome/148.0.7778.258 Safari/537.36	Mobile Silk 148	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.7778.258 Safari/537.36	Chrome 148	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/148.3.5 like Chrome/148.0.7778.258 Safari/537.36	Mobile Silk 148	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAPWI) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/148.0.7778.178 Safari/537.36	Chrome 148	Fire OS 8
Mozilla/5.0 (Linux; Android 11; KFRAPWI Build/RS8338.3339N; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/146.0.7680.165 Safari/537.36	Chrome Webview 146	Fire OS 8