Can't delete faces learned in Unihiker K10

Even if I've added the    ai.sendFaceCmd(DELETEALL);  command, every face learned is still there and face id keep incrementing.

/*!
* @file  FaceRecognition.ino
* @brief Press button A to learn the face and button B to detect the face.
* @copyright   Copyright (c) 2021 DFRobot Co.Ltd (http://www.dfrobot.com)
* @license     The MIT License (MIT)
* @author      
* @version     V1.0
* @date        2024-12-30
* @url         
*/
//有问题
#include "unihiker_k10.h"
#include "AIRecognition.h"

String ID;

void onButtonAPressed();
void onButtonBPressed();

UNIHIKER_K10  k10;
uint8_t       screen_dir=2;
AIRecognition ai;

void setup() {
   k10.begin();
   k10.initScreen(screen_dir);
   ai.initAi();
   ai.sendFaceCmd(DELETEALL);
   k10.initBgCamerImage();
   k10.setBgCamerImage(false);
   k10.creatCanvas();
   ai.switchAiMode(ai.NoMode);
   k10.buttonA->setPressedCallback(onButtonAPressed);
   k10.buttonB->setPressedCallback(onButtonBPressed);
   k10.setBgCamerImage(true);
   ai.switchAiMode(ai.Face);
}
void loop() {
   if (ai.isRecognized()) {
       ID = ai.getRecognitionID();
       k10.canvas->canvasText((String("Face ID: ") + String(ID)), 0, 0, 0x0000FF, k10.canvas->eCNAndENFont24, 50, true);
       k10.canvas->canvasText(ID, 0, 30, 0x0000FF, k10.canvas->eCNAndENFont24, 50, true);
       k10.canvas->updateCanvas();
   }
}

void onButtonAPressed() {
   k10.rgb->write(-1, 0x00FF00);
   ai.sendFaceCmd(ENROLL);
}
void onButtonBPressed() {
   k10.rgb->write(-1, 0x0000FF);
   ai.sendFaceCmd(RECOGNIZE);
}