VIM3 does not come up after "fastboot reboot bootloader"

After attempting the following

fastboot oem format
fastboot flash bootloader u-boot_kvim3_noab.bin
fastboot erase bootenv
fastboot reboot bootloader

VIM3 pro stuck in white light flashing, tried power, reset button, nothing can get the board to either fastboot devices or adb devices.

@tenk.wang can help check this problem

@HLVim3 You can refer to this.
VIM3 Android R(11) V210604 Preview Rom Release - Announcements - Khadas Community