Rock Pi S 4Gb not boot from nand

4gb Nand flashing completed without errors.
When I try to boot Rock Pi S from nand there is no output to console and heartbeat led does not blinking.
From sd card Rock Pi boot successefuly.
How I can check nand for errors?

Hi, @marvin21

Can you take a picture of your ROCK Pi S, is it the S version RK3308?

the same problem takes to me