[ojerez]

It works well and you can keep Android in the Internal and LibreElec booting from the SD Card if you want
(to determine boot simply insert the SD Card - or not)

Hi, How I can put LibreElec in SD Card

This method is OK:

SD card/USB drive:
Note: only 1 USB port is able to boot the box. You have to try them all.
Download img.gz file and burn it to SD card/USB drive: http://wiki.libreelec.tv/index.php?title=Installation
After this you will see that drive capacity is 512MB. This is OK as there is a second (hidden) partition on the drive for LE userdata!
S905 only: Download a device tree, rename it to dtb.img and copy it to main folder of SD card/USB drive - replace the one that's already there.
S905X only: You can either keep dtb.img that is provided on SD card or download a dedicated way (they will work the same!).
To boot the system for the first time you have to use one of the following:
toothpick method: disconnect the power supply, insert card/drive, use a toothpick to push reset button and connect the power while holding the button. Wait until LibreELEC logo appears and release the button.
recovery method: boot into Android, insert card/thumb drive and choose Reboot to recovery. Your box should boot into LibreELEC.
recovery method (take 2nd variant): if you have "Update" app pre-installed open it, insert SD card with LE/connect USB drive, and choose any ZIP file in the app for update. Your box should reboot to LE.

Thanks