PICOWH memory OSerror by Firebase and LCD

Question

from machine import Pin,SPI,PWM
import framebuf
import time
import os
import gc
##################### FIREBASE ########################
import network
import urequests

BL = 13
DC = 8
RST = 12
MOSI = 11
SCK = 10
CS = 9

'2inch frames'
class LCD_2inch(framebuf.FrameBuffer):
    def __init__(self):
        self.width = 300 #actual size was 320, but decreased since of memory
        self.height = 220 #actual size of 240, but decreased since of memory
        
        self.cs = Pin(CS,Pin.OUT)
        self.rst = Pin(RST,Pin.OUT)
        
        self.cs(1)
        self.spi = SPI(1)
        self.spi = SPI(1,1000_000)
        self.spi = SPI(1,1000_000_00,polarity=0, phase=0,sck=Pin(SCK),mosi=Pin(MOSI),miso=None)
        self.dc = Pin(DC,Pin.OUT)
        self.dc(1)
        self.buffer = bytearray(self.height * self.width*2)
        super().__init__(self.buffer, self.width, self.height, framebuf.RGB565)
        self.init_display()
        
        self.RED   =   0x07E0
        self.GREEN =   0x001F
        self.BLUE  =   0xF800
        self.WHITE =   0xffff
        self.BLACK =   0x0000
//after several def(unimportant codes)

if __name__=='__main__':
        

    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)

    # connecting to wifi
    if not wlan.isconnected():
        wlan.connect("KT_GiGA_89C2", "9bc27xf161") # wifi_data
        print("Waiting for Wi-Fi connection", end="...")
        while not wlan.isconnected():
            print(".", end="")
            time.sleep(1)
    else:
        print(wlan.ifconfig())
        print("WiFi is Connected")

    print("Wifi is connected")

    # URL for Firebase
    url = "https://embeded-system-e8163-default-rtdb.firebaseio.com/"

    initial_string = "0"
    # updating initial state
    initial_state = {'phone': initial_string}
    urequests.patch(url+"/embeded_system.json", json = initial_state).json()

    phone_number = "0"
    
# first string     
    response = urequests.get(url+"/embeded_system.json").json()
    while (response["phone"] == phone_number):
        response = urequests.get(url+"/embeded_system.json").json()
        print("Waiting for the update of phone number...")
    phone_number = response['phone']
    print(f"Updated phone number to {phone_number}")
    pwm = PWM(Pin(BL))
    pwm.freq(1000)
    pwm.duty_u16(32768)#max 65535
    LCD = LCD_2inch()
    #color BRG
    LCD.fill(LCD.WHITE)

    
    
    while(1):
        if wlan.isconnected(): # phone number update only the data has changed
            response = urequests.get(url+"/embeded_system.json").json()
            if (phone_number != response['phone']): 
                phone_number = response['phone']
        
        for i, number in enumerate(phone_number):
            x = (i % 6) * (50)+5  
            y = (i // 6) * (90 + 20)+10  
            LCD.draw_number(number, x, y, LCD.BLACK)
        
        '''for i in range(len(phone_number)): #for the lens(unimportant)
            number = phone_number[-(i + 1)]
            x = (i % 6) * 50 + 5
            y = ((1 if i < 6 else 0)) * (90 + 20) + 10
            LCD.draw_number(number, x, y, LCD.BLACK)'''
        LCD.show()
        LCD.rst()
        time.sleep(1)

I'm now handling simple Picowh project, receives string data(ints) from Firebase, and write out them in LCD panel. Since picowh doesn't have enough RAM, so I reduced size of height to decrease buffer size.

It still receives

OSError: [Errno 12] ENOME

at the line "response = urequests.get(url+"/embeded_system.json").json()" I tried sort of gc.collect() or response.close() , but I'm not so good at Micropython, so it doesn't work well.. What should I do??