diagus
Here's a Play 2 u-boot that will boot by default from sd card (unless you press the remote power button, in which case it will try to boot from eMMC, which in your case and mine, doesn't work).
Just write is to the sdcard where you have LE9 and it should work.
Just one note, the screen will be black for a few seconds on bootup in case u-boot cannot find the boot splash image in eMMC
u-boot.bin.sd.bin