Where do you live? I'm pretty sure that one can't renounce the mandatory warranty for stuff bought in the EU, so if you live here, you should be OK (but don't blame me if they're hard to convince!).
" the injured party must prove that: damage took place, your product was defective, the defect and the damage were linked."
"You bear no liability if you can prove that: he defect causing the damage did not exist when the product was placed on the market"