Latest Mobile Silk 138 user agents:

User Agent Platform Device
Mozilla/5.0 (Linux; Android 9; KFONWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.13.4 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 8 (2020)
Mozilla/5.0 (Linux; Android 9; KFKAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.13.4 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 8 (2018)
Mozilla/5.0 (Linux; Android 9; AFTSS) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.13.4 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire TV Stick Lite (Gen 1)
Mozilla/5.0 (Linux; Android 9; KFMAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.13.4 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 10 (2019)
Mozilla/5.0 (Linux; Android 9; AFTKA) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.13.4 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire TV Stick 4K Max
Mozilla/5.0 (Linux; Android 9; KFTRWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.12.1 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 10 (2021)
Mozilla/5.0 (Linux; Android 9; KFTRWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.13.4 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 10 (2021)
Mozilla/5.0 (Linux; Android 9; AFTSS) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.12.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire TV Stick Lite (Gen 1)
Mozilla/5.0 (Linux; Android 9; AEOCY) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.13.4 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.12.1 like Chrome/138.0.7204.244 Safari/537.36 GNU/Linux Unknown
Mozilla/5.0 (Linux; Android 9; KFMAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.12.1 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 10 (2019)
Mozilla/5.0 (Linux; Android 9; KFONWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.12.1 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 8 (2020)
Mozilla/5.0 (Linux; Android 9; AFTSSS) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.12.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire TV Stick (Gen 3)
Mozilla/5.0 (Linux; Android 9; AFTKA) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.11.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire TV Stick 4K Max
Mozilla/5.0 (Linux; Android 9; AFTGAZL) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.11.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire TV Cube (Gen 3)
Mozilla/5.0 (Linux; Android 9; KFTRPWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.11.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 10 Plus (2021)
Mozilla/5.0 (Linux; Android 9; AFTSSS) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.11.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire TV Stick (Gen 3)
Mozilla/5.0 (Linux; Android 9; AFTSS) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.11.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire TV Stick Lite (Gen 1)
Mozilla/5.0 (Linux; Android 9; KFMAWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.11.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 10 (2019)
Mozilla/5.0 (Linux; Android 9; KFTRWI) AppleWebKit/537.36 (KHTML, like Gecko) Silk/138.11.2 like Chrome/138.0.7204.244 Safari/537.36 Fire OS 7 Fire HD 10 (2021)