I am now using TWR-VF65GS10 and I want to change the bootloader so that I can boot new image, but I don't know where to put my new u-boot, I found a step in Timesys Getting Started Guide and Booting the Freescale Vybrid TWR-VF65GS10 | Timesys Embedded Linux
and try the command
sudo dd if=u-boot.imx of=/dev/sdX bs=512 seek=2
But I got the same result, the u-boot still want to find the original kernel image, which means the original u-boot were still there?
What can I do the change it to the new one?