Ok will try.
On more question. With Win32DiskImager I write LibreELEC-S912.arm-8.2-184.108.40.206.img to flash drive.
I also have gxm_q200_2g.dtb - which I think is for my version of GT1.
In the video it says to rename gxm_q200_2g.dtb to dtb.img, but when I write the LibreElec img it creates dtb.img.
Should I replace it?