SemcTool v8.7 Cracked does not work so how could it kill phones?
semc tool 3.3 and 8.4 is no risk to use i have using it many times and all the phones is working.
but if you dont have what it takes then you could end up with dead phones.
learn something about the tool before you try something.
after you have learn about the tool the you will unlock and repair phones with it withouth problems.