No Android boot image, no recovery partition, no vendor partition.

Before you begin, it's critical to understand the risks. Flashing a custom ROM can your device if done incorrectly, turning it into an unusable paperweight. You must ensure your device model and its hardware revisions match the ROM you intend to install. For instance, some Allwinner H6 devices have 4GB of RAM, but due to kernel limitations, you might only be able to use 3GB. This isn't a malfunction, but a known technical constraint you should be aware of before installing Linux-based systems.