It was flashed with UiFLow official software to be seamlessly connected to web code designer
Order date: Aug 20, 2025 , but arrival was later due to the company announced holidays

Version of UIFlow: 2.3.7

Steps to re-production: any code or blocks placed on the field is not saving, but on preview it shows

Example code:
i hope it could be helpful since it is in the rules of bug report posting

import os, sys, io
import M5
from M5 import *
import network
from hardware import I2C
from hardware import Pin
from unit import MiniOLEDUnit
import time

wifi_status = None
Hr = None
Min = None
Sec = None
Hr_line = None
Min_line = None
Sec_line = None
wlan = None
i2c0 = None
minioled_0 = None

Hour = None
Minute = None
Second = None
tuple0 = None

def setup():
global wifi_status, Hr, Min, Sec, Hr_line, Min_line, Sec_line, wlan, i2c0, minioled_0, Hour, Minute, Second, tuple0

M5.begin()
M5.Lcd.setBrightness(100)
wlan = network.WLAN(network.STA_IF)
i2c0 = I2C(0, scl=Pin(1), sda=Pin(2), freq=100000)
minioled_0 = MiniOLEDUnit(i2c0, 0x3c)
Widgets.fillScreen(0x000000, minioled_0)
wifi_status = Widgets.Label("wifi", 13, 0, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu9, minioled_0)
Hr = Widgets.Label("HR", 0, 10, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu9, minioled_0)
Min = Widgets.Label("Min", 0, 20, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu9, minioled_0)
Sec = Widgets.Label("Sec", 0, 29, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu9, minioled_0)
Hr_line = Widgets.Label("Hours", 21, 10, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu9, minioled_0)
Min_line = Widgets.Label("Minutes", 21, 20, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu9, minioled_0)
Sec_line = Widgets.Label("Seconds", 21, 29, 1.0, 0xffffff, 0x222222, Widgets.FONTS.DejaVu9, minioled_0)
time.timezone('GMT+3')
wlan.connect('SSID_NAME', 'PASSWORD')
tuple0 = time.localtime()
Hour = tuple0[3]
Minute = tuple0[4]
Second = tuple0[5]

def loop():
global wifi_status, Hr, Min, Sec, Hr_line, Min_line, Sec_line, wlan, i2c0, minioled_0, Hour, Minute, Second, tuple0
M5.update()
if wlan.isconnected():
wifi_status.setText(str('Wifi OK'))
if not (wlan.isconnected()):
wifi_status.setText(str('Wifi NO'))
tuple0 = time.localtime()
Hour = tuple0[3]
Minute = tuple0[4]
Second = tuple0[5]
Hr.setText(str(Hour))
Min.setText(str(Minute))
Sec.setText(str(Second))
while not (BtnA.wasSingleClicked()):
M5.Lcd.setBrightness(0)
break
while BtnA.wasClicked():
M5.Lcd.setBrightness(100)
time.sleep(5)
break

if name == 'main':
try:
setup()
while True:
loop()
except (Exception, KeyboardInterrupt) as e:
try:
from utility import print_error_msg
print_error_msg(e)
except ImportError:
print("please update to latest firmware")