<![CDATA[Cardputer COM Not Working]]>Hello. I just bought a Cardputer (M5 Stack v0.9) and I'm trying to change the firmware to a custom version. I'm using Windows 11 (22631.3085) with M5Burner-v3-beta-win-x64. Just for the record, have Python 3.11.4.

I want to install the "Nemo" firmware (https://github.com/n0xa/m5stick-nemo I am aware that it is an unofficial version) and I am following the following steps on the documentation: https://docs.m5stack.com/en/quick_start/m5stickc_plus/uiflow

  1. Installed FTDI drivers;
  2. Downloaded M5 Burner
  3. Downloaded Nemo 2.3.3 inside M5 Burner
  4. M5 Burner finds COM3.
  5. When trying to burn, I get stuck connecting to the device and get the following error:

--chip auto --port COM3 --baud 115200 --before default_reset write_flash -z --flash_mode dio --flash_freq 80m --flash_size detect 0x000 C:\Users\User\Downloads\M5Burner-v3-beta-win-x64\packages\firmware\e7fcb8d6a9c59e5db631bfd5e9d77227.bin
esptool.py v4.6.2
Serial port COM3
Connecting...
.
.

.
.
A fatal error occurred: Failed to connect to Espressif device: No serial data received. For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html

  1. I checked the troubleshooting page. The device is being powered via USB, I have tried all bauld rates available on the M5Burner. I tried using Arduino's IDE Serial Monitor to check the connection, but the device was not recognized. Error persists.

Am I missing any details?
Thanks in advance!

]]>https://community.m5stack.com/topic/6026/cardputer-com-not-workingRSS for NodeWed, 29 Apr 2026 01:49:23 GMTFri, 26 Jan 2024 23:21:16 GMT60<![CDATA[Reply to Cardputer COM Not Working on Tue, 03 Jun 2025 10:42:35 GMT]]>Make sure you're holding the "G0" or "BOOT" button while plugging in the USB or clicking "Burn"—this puts the Cardputer into flash mode. Also try a different USB cable (some are charge-only), and plug directly into your PC (avoid hubs). Lastly, check Device Manager to confirm the COM port is stable and not switching. If all else fails, try flashing with esptool manually via command line.

]]>https://community.m5stack.com/post/29192https://community.m5stack.com/post/29192Tue, 03 Jun 2025 10:42:35 GMT<![CDATA[Reply to Cardputer COM Not Working on Sun, 18 May 2025 10:38:43 GMT]]>Got it working with a different USB cable, and I didn't need to push any buttons to get it in to download mode. M5Burner worked fine.

]]>https://community.m5stack.com/post/29066https://community.m5stack.com/post/29066Sun, 18 May 2025 10:38:43 GMT<![CDATA[Reply to Cardputer COM Not Working on Fri, 04 Oct 2024 22:32:35 GMT]]>@Ariel-Jorge , Thanks! It worked perfectly for me!

]]>https://community.m5stack.com/post/26618https://community.m5stack.com/post/26618Fri, 04 Oct 2024 22:32:35 GMT<![CDATA[Reply to Cardputer COM Not Working on Mon, 08 Jul 2024 00:03:37 GMT]]>Perfect, I had the same problem after installing UIFlow 2.0, it didn't detect the correct COM, using this method of holding the btnGo and then turning on the device the correct COM started working again (remembering that by doing this, the device remains with the screen disconnected, but communication works again). Thank you very much.

]]>https://community.m5stack.com/post/25775https://community.m5stack.com/post/25775Mon, 08 Jul 2024 00:03:37 GMT<![CDATA[Reply to Cardputer COM Not Working on Fri, 14 Jun 2024 16:08:22 GMT]]>I was having the same problems with my CardPuter not being recognised when connecting to USB with the Go button depressed but after reading through this thread I finally tried another USB 'C' cable and the Windows 7 system finally tried to install drivers for the unit.
It installed one USB driver but failed to install the 'USB JTAG/serial debug monitor' driver.
Where can I find this driver to download for Windows 7 ?
At the moment when I hit the 'Burn' button on the Burner program I get an error box pop up which says 'Get mac failed'

]]>https://community.m5stack.com/post/25558https://community.m5stack.com/post/25558Fri, 14 Jun 2024 16:08:22 GMT<![CDATA[Reply to Cardputer COM Not Working on Tue, 07 May 2024 19:03:21 GMT]]>"I had a similar issue with not recognizing the COM port, but after some testing, I found out that on my laptop, the cardputer's COM port only recognizes when I connect it through the laptop's USB type C port."

]]>https://community.m5stack.com/post/25103https://community.m5stack.com/post/25103Tue, 07 May 2024 19:03:21 GMT<![CDATA[Reply to Cardputer COM Not Working on Wed, 24 Apr 2024 10:35:27 GMT]]>@ajb2k3 Thank you for that information. I had seen somewhere that a CP2102 driver for windows was necessary, that appears to be not required. After numerous tries with a USB A to USB -C cables which had the data and power wired through, I went and bought a fat cable capable of 60W and fast data - as soon as I pressed G0 and inserted the cable windows immediately assigned a COM Port.
I am very grateful that you pointed out that the Stamp-S3 has its own built USB>TTL converter!

]]>https://community.m5stack.com/post/24920https://community.m5stack.com/post/24920Wed, 24 Apr 2024 10:35:27 GMT<![CDATA[Reply to Cardputer COM Not Working on Thu, 18 Apr 2024 18:42:40 GMT]]>Fiz tudo isso e não resolveu. Entretanto, coloquei inserir o cabo e manti pressionado o botão a baixo do adesivo e cliquei em instalar o Nemo. Mantive pressionando até o final da instalação. Após finalizar tudo, eu soltei. Funcionou, graças a Deus!!!

]]>https://community.m5stack.com/post/24861https://community.m5stack.com/post/24861Thu, 18 Apr 2024 18:42:40 GMT<![CDATA[Reply to Cardputer COM Not Working on Sun, 14 Apr 2024 21:57:49 GMT]]>I was also getting the "not in bootloader mode" error as well - and with a very trusted USB-C to USB-C cable! Then remembered I had the FlipperZero box with me and tried that cable - which WORKED! So, this is not the main reason to buy one obviously, but if you do have one and you're experiencing this error on a Mac (M1) then this is something to try. The "not in bootloader mode" error is a little misleading in this case as the cardputer was doing its part, but the first "trusted" cable was not!

]]>https://community.m5stack.com/post/24800https://community.m5stack.com/post/24800Sun, 14 Apr 2024 21:57:49 GMT<![CDATA[Reply to Cardputer COM Not Working on Fri, 12 Apr 2024 05:20:39 GMT]]>The CP210X is not used as the StampS3 has it own internal USB >TTL converter.

]]>https://community.m5stack.com/post/24752https://community.m5stack.com/post/24752Fri, 12 Apr 2024 05:20:39 GMT<![CDATA[Reply to Cardputer COM Not Working on Wed, 24 Apr 2024 10:40:27 GMT]]>@leazevi
The issue is that the drivers are not being recognised by Windows 10 when the cardputer is not connected and so when it is connected via USB and G0 + RST are pressed USB JTAB is not activated. There is a permanent yellow triangle next to whatever flavour of CP210X driver is installed.
I now believe that the CP2102 driver not being recognised by Windows 10/11 is a read herring and I wasted a lot of time in research on the web to try to get it going. In the end I got a 'fat' USBA-USBC cable capable of fast data and 60W power charging.
I then did as you suggested and immediately Windows recognised the device and assigned it a COM Port.
Many thanks for your help

]]>https://community.m5stack.com/post/24741https://community.m5stack.com/post/24741Wed, 24 Apr 2024 10:40:27 GMT<![CDATA[Reply to Cardputer COM Not Working on Wed, 01 May 2024 04:15:37 GMT]]>@hanktttop

  • Connect Cardputer on PC
  • Open the Device Manager
  • View > Show Hidden Devices
  • Try Hold G0 and click RST until the USB JTAG becomes enable
]]>https://community.m5stack.com/post/24552https://community.m5stack.com/post/24552Wed, 01 May 2024 04:15:37 GMT<![CDATA[Reply to Cardputer COM Not Working on Wed, 06 Mar 2024 21:56:38 GMT]]>@ajb2k3 Sorry delay, my nick is has.oliveira

]]>https://community.m5stack.com/post/24277https://community.m5stack.com/post/24277Wed, 06 Mar 2024 21:56:38 GMT<![CDATA[Reply to Cardputer COM Not Working on Mon, 04 Mar 2024 08:46:00 GMT]]>@hanktttop said in Cardputer COM Not Working:

@ajb2k3 Yes, I tested the first time this was suggested. In fact, the first cable I was using was just for charging a portable gaming console. Then I tried a few more, inclund cables for smartphones, external drives, etc. And I tested then on their specific devices, everything normal.

No idea why the cheapest one worked on cardputer, though.

I'm glad you have it working now...mark this cable up as Cardputer saver cable

]]>https://community.m5stack.com/post/24248https://community.m5stack.com/post/24248Mon, 04 Mar 2024 08:46:00 GMT<![CDATA[Reply to Cardputer COM Not Working on Sat, 02 Mar 2024 16:54:13 GMT]]>@ajb2k3 Yes, I tested the first time this was suggested. In fact, the first cable I was using was just for charging a portable gaming console. Then I tried a few more, inclund cables for smartphones, external drives, etc. And I tested then on their specific devices, everything normal.

No idea why the cheapest one worked on cardputer, though.

]]>https://community.m5stack.com/post/24233https://community.m5stack.com/post/24233Sat, 02 Mar 2024 16:54:13 GMT<![CDATA[Reply to Cardputer COM Not Working on Sat, 02 Mar 2024 16:31:24 GMT]]>Might be a stupid question but did you make sure all the tested cables were data cables and there are quite a lot of charge only cables.
Glad you finally got it working.

]]>https://community.m5stack.com/post/24232https://community.m5stack.com/post/24232Sat, 02 Mar 2024 16:31:24 GMT<![CDATA[Reply to Cardputer COM Not Working on Sat, 02 Mar 2024 14:00:07 GMT]]>Updating: After buying another batch of cables, I finally got a connection and can install firmware on the cardputer. For reference, it was this cable here. There is no specification, it is one of the cheapest you can find. With it, I just pressed BtnGo and connected. In fact, the S3's LED did not blink or light up at any time.

Thanks everyone for the comments, it was a long thread. xD
Maybe we can learn with types of cable doesn't work with cardputer and why they don't work after all. xD

]]>https://community.m5stack.com/post/24231https://community.m5stack.com/post/24231Sat, 02 Mar 2024 14:00:07 GMT<![CDATA[Reply to Cardputer COM Not Working on Wed, 28 Feb 2024 17:56:30 GMT]]>@ajb2k3 Yup, I think this thread have (almost) all the possible methods of flashing the cardputer. Tried all posted here, the one on the FAQ, some I saw on other threads and Reddit (all very similar, just changing the order of pressing the buttons), some suggested on Github, etc. :(

]]>https://community.m5stack.com/post/24182https://community.m5stack.com/post/24182Wed, 28 Feb 2024 17:56:30 GMT<![CDATA[Reply to Cardputer COM Not Working on Wed, 28 Feb 2024 11:30:56 GMT]]>@hanktttop have you used the firmware flashing method I posted in the forum?

]]>https://community.m5stack.com/post/24175https://community.m5stack.com/post/24175Wed, 28 Feb 2024 11:30:56 GMT<![CDATA[Reply to Cardputer COM Not Working on Tue, 27 Feb 2024 16:55:51 GMT]]>@has-oliveira Tried multiple cables, no one worked. Did you used any specific brand?

]]>https://community.m5stack.com/post/24171https://community.m5stack.com/post/24171Tue, 27 Feb 2024 16:55:51 GMT<![CDATA[Reply to Cardputer COM Not Working on Tue, 27 Feb 2024 16:01:24 GMT]]>@has-oliveira who are you on the cardputer discord

]]>https://community.m5stack.com/post/24169https://community.m5stack.com/post/24169Tue, 27 Feb 2024 16:01:24 GMT<![CDATA[Reply to Cardputer COM Not Working on Tue, 27 Feb 2024 13:26:27 GMT]]>@hanktttop I have the same problem, my cardputer arrived yesterday, a follow all sugestions on this post.

Then I ask on discord channel hackingtroop about the problem, and their sugesto to try another cable, It's works. But one point of attention, the LED don't work as expected, anyway the cardputer enter on download mode.

Hold BtnGO, plug in o cable, and burn firmware. With the new cable, just plug and MM5Burner show pop-up about device found.

]]>https://community.m5stack.com/post/24168https://community.m5stack.com/post/24168Tue, 27 Feb 2024 13:26:27 GMT<![CDATA[Reply to Cardputer COM Not Working on Fri, 23 Feb 2024 19:09:59 GMT]]>You can get the StampS3 separately (the core of the Cardputer) and experiment on that.

]]>https://community.m5stack.com/post/24078https://community.m5stack.com/post/24078Fri, 23 Feb 2024 19:09:59 GMT<![CDATA[Reply to Cardputer COM Not Working on Fri, 23 Feb 2024 15:54:10 GMT]]>@ajb2k3 Thanks, still nothing.

Thank you very much to everyone who commented and helped, but I think I'll stop here. It took so many tries that some of the S3 pins are starting to bend, even though I'm careful when removing/inserting the chip.

I think I could end up damaging the cardputer if I continue with this stress on the components. I must continue my studies with simpler devices like the Portapack Mayhem until further notice.

Thank you very much for your comments, it is a very receptive community.

]]>https://community.m5stack.com/post/24071https://community.m5stack.com/post/24071Fri, 23 Feb 2024 15:54:10 GMT