Is it possible to send a criminal case back for retrial? How long will the case be closed and will the procuratorate participate in the investigation during the retrial?

If a criminal case is sent back for retrial, if it is not a procedural problem, it is a problem of evidence, and the possibility of changing the sentence is relatively high; The duration of the trial is the same as that of the first instance; Retrial means that the court and procuratorate send it back to the first instance. The procuratorate still has to play the role of accusing crimes, of course, participating in litigation, but prosecutors and collegiate panels need to be re-appointed!