At the time I failed image it was an image created by me. My question is how do I make the board work again? When it start, just type that text. I can not write commands in uboot. I do not know what steps to follow to solve the problem. Should I short-circuit 1K resistance for recovery mode?
Note that the SoC on our i.MX 6 modules are fused to boot from eMMC. So this is typically not an option.
Yes your best bet is using the recovery mode. You can use tweezers to temporarily put the SoC into recovery mode. See also the video on the Toradex Easy Installer article.