TUTORIAL: Ejecutar TWRP en los Android TV-Box con SoC Rockchip
Black Seraph on Twitter: "And now the Anbernic RG552 made the jump to Android Pie as well, with software navigation buttons, a newer GPU driver, some more bugfixes and a new fingerprint.
Recovery] TWRP 3.2.3-0 released - Andoid - Radxa Forum