Sorry for this trouble taken.
We checked this issue, it seems that your X3000 hardware version is too old that cannot work with the new uboot version. Since we have taken some modification during the times.
We now have compile a new U-Boot bootloader for you, please kindly download in this link and upgrade.
Kindly noted, this U-Boot is ONLY for X3000 with the old hardware version, which cannot work with the bootloader at the top of this post.
Also noted not to power down the device during the upgrade. Thank you.