Muh Hew Please test if with this build your internal memory works correctly: mk808b-revert-mmc-bounce
No, unfortunately it does not work
I have also tested your OpenELEC 5.0.8.20 (kernel 3.10.61) and this does not work either.
There may be some difference with the eMMC driver between your kernel version and the factory Android version 3.10.33