is currently impossible because its bootloader cannot be unlocked While older iterations—such as the 7th and 8th-generation models—featured hardware vulnerabilities allowing developers to short operational contact points with a paperclip to bypass security, Amazon successfully patched these exploits in the 10th-generation MediaTek MT8168 platform.
Amazon's bootloaders are strictly locked with digital signatures. To install a ROM, developers must find a "bootrom" exploit (a flaw in the initial power-on code). While such flaws were found for the 2018 model (allowing for LineageOS 17.1), the 10th Gen (2020 amazon fire hd 8 10th generation custom rom