mithl-e-awwal

Q: Is it necessary for a hanafi to pray zohr salaah before misl-e-awwal? Due to some reason can a hanafi pray zohr salah after misl-e-awwal?

Q: Zaid prayed Zuhr Salaah in Asr misl-e-awwal time. Thereafter on the same day zaid prayed Asr Salaah in misl-e-awwal time. Is the Asr Salah valid? In the above situation if the Asr Salaah is not valid, does Zaid have make qadha of the Asar Salah?