Problem to Flash Chinesse Tablet MT6580

I have problems flashing the firmware of a tablet with **Mt6580**, I am using SP flash tools and Betools. The problem is that the flashing runs normally and ends without problems, but the tablet does not turn on. When reading the Region EMMC_USER with The SP flash tool, it is empty. However, the EMMC_BOOT region is the only one that is written and is where the preloader.bin is loaded, but the rest of the files are not written. What could it be that the EMMC_USER region is not written?