FIRMWARE
Echo Input (2018)
- Fire OS 6.5.7.3 (NS6573/6553) (code 12853025156, bundle com.amazon.cupcake.android.os)
https://d1s31zyz7dcc2d.cloudfront.net/2026/5/9/6cdc7988-487a-455e-be6e-12bb7e2e6a7d/update-kindle-cupcake-NS6573_user_6553_0012853025156.bin