Latest Amazon Fire TV Stick 4K (2023) user agents:

User Agent	Browser	Platform
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RMAIN1.3298N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RMAIN1.3294N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RMAIN1.3287N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RMAIN1.3281N)	Android Browser	Fire OS 8
Hulu/1.182.0 (Fire OS 8.1.7.4 (RS8174/3641); ; AFTKM; Build/Neutron - 1.4.596)	Hulu 1	Fire OS 8
MXPlayer/1.34.7 (Linux; Android 11; en-US; AFTKM Build/RS8174.3648N)	MX Player 1	Android 11
Mozilla/5.0 (Linux; Android 11; AFTKM) 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
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RMAIN1.3267N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RS8174.3648N)	Android Browser	Fire OS 8
Mozilla/5.0 (Linux; Android 11; AFTKM) 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; AFTKM Build/RMAIN1.3113N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RMAIN1.3254N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RS8180.136P)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RS8153.3202N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RMAIN1.3205N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RS8180.3718N)	Android Browser	Fire OS 8
ExoMedia 3.3.0r (64) / Android 11 / AFTKM	Android Browser	Android 11
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RMAIN1.3110N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RS8158.4105N)	Android Browser	Fire OS 8
Dalvik/2.1.0 (Linux; U; Android 11; AFTKM Build/RS8174.3646N)	Android Browser	Fire OS 8