my board S902x
I have download Armbian_20.10_Arm-64_bionic_current_5.9.0.xz from https://disk.yandex.ru/d/_rQgn_FosYuW0g/20.10/20201014
I extract xz -d Armbian_20.10_Arm-64_bionic_current_5.9.0.xz
then burn using balena
some changes are
extlinux/extlinux.conf
LABEL Armbian
LINUX /zImage
INITRD /uInitrd
FDT /dtb/amlogic/meson-gxl-s905x-p212.dtb
APPEND root=LABEL=ROOTFS rootflags=data=writeback rw console=ttyAML0,115200n8 console=tty0 no_c