The State of Custom ROMs for the Amazon Fire HD 8 (10th Generation)
While you can't install a custom ROM like LineageOS yet, you can still significantly change the experience using "software-only" methods: amazon fire hd 8 10th generation custom rom
If you love the process of hacking hardware, the Fire HD 8 (10th Gen) is a legendary device. It is the cheapest tablet capable of running a near-stock version of Android 13. The State of Custom ROMs for the Amazon
Here’s a proper, original feature idea tailored for a custom ROM on the Amazon Fire HD 8 (10th generation, codename “Oneta”): amazon fire hd 8 10th generation custom rom
If you are hunting for ROMs, ensure you have the correct device details to avoid "bricking" (rendering the tablet unusable): Amazon Fire HD 8 and HD 10 - XDA Forums
Since you cannot replace the OS entirely, most users turn to the Fire Toolbox on platforms like XDA Developers to make the tablet feel like "stock" Android: