recovery method (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.
Try above method.
Link to issue no reset. Firmware Stock OTA & .IMG UPDATE FIX MECOOL M8S PRO PLUS ANDROID 7.1.1 AMLOGIC S905X 2GB/16GB - FreakTab.com