What are the requirements for a defendant to file a supplemental brief in an appeal?

Appointed counsel filed an opening brief that sets forth the facts of the case and asks us to determine whether there are any arguable issues on appeal. (People v. Wende, supra, 25 Cal.3d 436.) Counsel advised defendant of the right to file a supplemental brief within 30 days of the date of filing of the opening brief.

Defendant filed a supplemental brief arguing he received ineffective assistance of counsel because he was unaware that his attorney waived time for him. To establish ineffective assistance of counsel, a defendant must show counsel's performance was "deficient, in that it fell below an objective standard of reasonableness under prevailing professional norms." (People v. Mai (2013) 57 Cal.4th 986, 1009.) A defendant must

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