Das steht zu dem Dual Boot im oben genannten Link unter FAQ 9, 10
10. Can I dual boot android and CoreELEC?
Yes, dual booting will speed up CoreELEC and remove the need to use external media. To do so, you need to use the ceemc tool 317. In short, SSH 138 into you device; then run ceemmc -x; type in Y; then type in 1. Once the process is complete, remove your external media and enjoy. To speed up CoreELEC installed on the eMMC on Ugoos devices, go to Settings-> CoreELEC → Hardware → eMMC Speed Mode and change it to HS200/HS400.