What is the test for a defendant to appeal against a finding that he waived his right to self-representation by pleading not guilty to a charge of assault?

contention on the trial court's failure to readvise him of the detriments of self-representation and his increased custodial exposure when the People amended the information to add the charge. "On appeal, we review the entire record, including proceedings after the invocation of the right to self-representation, and determine de novo whether the defendant's waiver of the right to counsel was knowing and voluntary." (People v. Conners (2008) 168 Cal.App.4th 443, 454.)