Thanks for your support @felmue, today I received my new M5Stack CORE2 and the SD card was immediately, so the card is not the problem, the problem is the fire M5Stack FIRE that has a problem. I have verified the great quality that CORE2 has, the truth is that it is very very good. I'm going to do more tests to see how it works.

Hello, thank you very much for your answers, I have tried from UIFlow and it has not worked for me, and then I have tried with the code that @felmue has sent me and it does not work either, it returns the error code "OSError: [Errno 19] ENODEV" .
I am beginning to think that it is a problem with Firmware 1.7.1 for M5Stack FIRE or Hardware of M5Stack FIRE.
I have tested the card on other devices and it works without problems. It is formatted with FAT32 and has 16GB.

@gaviota I have tried the following and it gives me error:

import os
os.mountsd()
os.listdir('/sd')

@gaviota I have tried the following and it gives me error:

import uos
uos.sdconfig(uos.SDMODE_SPI,clk=18,mosi=23,miso=19,cs =4)
uos.mountsd()

@gaviota I have tried the following and it gives me error:

from m5stack import *
from m5ui import *
from uiflow import *
import os
sd_mount()

@gaviota I am thinking that it is a problem with the firmware version v1.7.1 of the M5Stack FIRE.

Hello, thanks for your comment, I have it formatted with FAT32.
I think the problem is that the / sd drive is not mounted.
I am testing with the following code:

from m5stack import *
from m5ui import *
from uiflow import *

setScreenColor(0x222222)

with open('/sd/test.txt', 'w+') as fs:
      fs.write('Hello World')

And it gives me the following error: OSError: [Errno 19] ENODEV

Hi, SD card not working on M5Stack FIRE.
Do you know what may be happening?

Hello there are still to be implemented (Speaker, IMU, RGB, etc ...) in UIFlow v1.7.1 for M5Stack FIRE.
Does anyone know what can be done?

@inasawa Thank you very much for the information and help.