Latest Mobile Silk 67 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 5.1.1; KFSUWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.6.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 10 (2017)
Mozilla/5.0 (Linux; Android 5.1.1; KFSUWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.4.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 10 (2017)
Mozilla/5.0 (Linux; Android 5.1.1; KFGIWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.6.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 8 (2016)
Mozilla/5.0 (Linux; Android 5.1.1; KFGIWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.4.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 8 (2016)
Mozilla/5.0 (Linux; Android 5.1.1; KFGIWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.2.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 8 (2016)
Mozilla/5.0 (Linux; Android 5.1.1; KFFOWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.4.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire 7"
Mozilla/5.0 (Linux; Android 5.1.1; KFFOWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.3.2 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire 7"
Mozilla/5.0 (Linux; Android 5.1.1; KFFOWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.2.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire 7"
Mozilla/5.0 (Linux; Android 5.1.1; KFDOWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.6.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 8 (2017)
Mozilla/5.0 (Linux; Android 5.1.1; KFDOWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.4.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 8 (2017)
Mozilla/5.0 (Linux; Android 5.1.1; KFAUWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.6.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 7 (2017)
Mozilla/5.0 (Linux; Android 5.1.1; KFAUWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.2.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 7 (2017)
Mozilla/5.0 (Linux; Android 5.1.1; KFASWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.6.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 7
Mozilla/5.0 (Linux; Android 5.1.1; KFASWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.4.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 7
Mozilla/5.0 (Linux; Android 5.1.1; KFASWI Build/LVY48F) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.2.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 5 Fire HD 7
Mozilla/5.0 (Linux; Android 4.4.4; SD4930UR Build/KTU84P) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.4.1 like Chrome/67.0.3396.87 Mobile Safari/537.36 Android 4 Fire Phone
Mozilla/5.0 (Linux; Android 4.4.3; KFTHWI Build/KTU84M) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.6.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 4 Kindle Fire HDX 7" WiFi
Mozilla/5.0 (Linux; Android 4.4.3; KFTHWI Build/KTU84M) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.4.1 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 4 Kindle Fire HDX 7" WiFi
Mozilla/5.0 (Linux; Android 4.4.3; KFTHWI Build/KTU84M) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.3.2 like Chrome/67.0.3396.87 Safari/537.36 Fire OS 4 Kindle Fire HDX 7" WiFi
Mozilla/5.0 (Linux; Android 4.4.3; KFTHWI Build/KTU84M) AppleWebKit/537.36 (KHTML, like Gecko) Silk/67.1.37 like Chrome/67.0.3396.68 Safari/537.36 Fire OS 4 Kindle Fire HDX 7" WiFi