HI,
from android i launched update & restore, i choosed a zip file and clicked on update, after the reboot, i choosed to reboot on bootloader. after that the arlinuxmedia launched but i have a message "ssh: can't access tty; job control turned off".
i re-writed the sdcard and now openelec is working great without the ssh error. thank's for
=>i guess entering the bootloader has made the box able to boot into openelec from SDCARD.
edit => after updating from 105l to 106l, i lost the capability of runing openelec from SDcard. i had to reboot on bootloader to reactivate it.