It's just that the utility model has not been verified and its stability is poor! The so-called poor stability means that it is easy to be invalidated, but this does not mean that someone will invalidate it, and the final result will be invalid. It depends on the debate between the two sides or the actual situation.
Invalidation is something that anyone can mention after a patent is granted.
2, the second question is estimated that even if you improve your score, it is difficult for someone to answer it. It's too professional to type clearly.