Hi Bough, On Wed, Feb 12, 2020 at 11:33 PM BOUGH CHEN <haibo.chen@xxxxxxx> wrote: > The board I use is SCH-29615 REV B4. This board use Sandisk eMMC chip. Maybe your board use Micron eMMC. Mine is REV B3 with the Micron eMMC. > I attach the bootloader I use. Please try this bootloader on your side. I hope we don't have a bootloader dependency here. Thanks