FIRMWARE
Fire HD 8 (2017)
- Fire OS 5.3.7.3 (659664620) (code 659664620, bundle com.amazon.douglas.android.os)
https://fireos-tablet-updates.s3.us-west-2.amazonaws.com/0ddfeap1GXdqCPab39o1Yn1dWv/update-kindle-Fire_HD8_7th_Gen-50.6.5.9_user_659664620.bin