Amazon Fire HD 10 2019 (maverick) for /e/OS-T 1.21
e-1.21-t-20240502-UNOFFICIAL-maverick.zip
https://sourceforge.net/projects/eosbuildsronnz98/files/OtherSmartphones/e-1.21-t-20240502-UNOFFICIAL-maverick.zip/download
Please see sources and install instructions including recovery here:
https://xdaforums.com/t/rom-unofficial-11-arm64-lineageos-18-1-for-amazon-fire-hd-10-maverick-9th-gen.4575987/
Use it at your own risk!
Please support the developer(s)!