[Lenomanu]

I downloaded tecno c8 hios stock rom
The rom had a checksum error but i deleted the file
It boots but keeps on restarting every time the screen is off

[hovatek]

I downloaded tecno c8 hios stock rom
The rom had a checksum error but i deleted the file
It boots but keeps on restarting every time the screen is off

The rom's build likely isn't compatible with your phone.
Try other firmware @ https://www.hovatek.com/forum/thread-19278.html