He should discuss these issues with the attorney who represented him in court. Generally, the court will not re-assign a PO for him as Probation runs their own agency and judges do not micromanage the Probation Department. However, his attorney may be able to determine the best course of action to either get another PO assigned or explain to your BF what needs to be done.
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Penal Code 1203.3(a) and People v. Allen are the authority you want to cite in a motion, which is up to the discretion of the judge. There seems like there is more to the story than your short synopsis allows. Before filing such a motion, it would be smart to have your boyfriend sit down with an attorney to find out exactly what his options are.
I believe you mean 273. Formal probation is normal for this charge. You BF or his attorney can place the case back on calender before the sentencing judge and ask that the terms of probation be modified to informal probation. I doubt that the court assuming the DA had no objections would grant this request. It is always worth a try. Not liking a probation officer is not recognized as a good reason to terminate formal probation as almost all probationers don't like formal probation or their respective probation officers. Good luck. Hope this helps?