Turns on crashes then reboots.

It turns on crashes and reboots. Tried resetting but it just goes back to the original state like it was before resetting. Tried flashing stock rom (it was alredy on stock) but with locked bootloader through "Update from ADB" but it was just not working. Then i tried unlocking the bootloader but after reboot it just locked itself so i dont know what to do now. Any help would be apreciated.(Cant upload any videos or pictures)