quitroot !
I have managed by using method of afl1
I installed dbt via TWRP using android update and now LE is fully running from NAND.
Unpack following archive to empty SD card.
KI_PRO_twrp3.zip
Put card in box and restart it. If TWRP3 is not starting use toothpick method.In TWRP install from SD card KI_PRO_dtb.zip. Use USB mouse to control TWRP.
I just used "reboot update" from SSH LE
Original remote works !