If you are having a NanoPi R6C variant, replace fdtfile=rockchip/rk3588s-nanopi-r6s.dtb in /boot/armbianEnv.txt with fdtfile=rockchip/rk3588s-nanopi-r6c.dtb
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copy your OS image into any removable storage SD / USB Flash , etc (formatted by exfat or ext2/3/4 or fat)
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start OOWOW by press FUNCTION + RESET
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exit from wizard
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plug removable storage with OS image
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choose this image to write by menu → Write image to eMMC and up to .. mounts