@luksus There is people in Chinese successfully flashed the ROM, just checked.
I have lost interest in it. However, I hope that untick the Preloader part will work.

@luksus I have tried, but this list of build is not working. I flashed the earliest build of TB-X606F, but my tablet still loops on the Lenovo screen and red light. I wondered what had the 'Erase All' done, and whether it brick my tablet forever. Another possible thinking is my tablet is a Chinese-version one, so the rom is all wrong to me.

@luksus Hello bro, I have trouble downgrading my tablet. It is TB-X616M, which is similar to TB-X606X. I 'Erase all' it by accident and I need a rom of TB-X606F_USR_S100168_200828_BMP, but I cannot get it. Can you send me one on mega or other drive? Thanq very much.