<![CDATA[Can't upload with esptool.py to M5Atom on macOS Big Sur]]>I'm having trouble with uploading to an M5Atom using esptool.py on macOS Big Sur 11.2.2 with the error:

A fatal error occurred: Timed out waiting for packet header

I've tried to use the Updater_FW20200422 (suggested in another thread), but get another error with that tool:

Detecting M5Stack products.
Find M5Stack products.
Kernel driver deteched.
Apply magic success.

Fail to cast magic stage 2, please contact vendor.
Waiting for device in DFU mode.....................%

Otherwise the serial port works and I am able to use esptool.py to read_mac:

dean@lucky13 razzle % esptool.py --port  /dev/cu.usbserial-7D52471593 read_mac
esptool.py v3.0
Serial port /dev/cu.usbserial-7D52471593
Connecting....
Detecting chip type... ESP32
Chip is ESP32-PICO-D4 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, Embedded Flash, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: 50:02:91:92:3e:e8
Uploading stub...
Running stub...
Stub running...
MAC: 50:02:91:92:3e:e8
Hard resetting via RTS pin...

Any suggestions on how to proceed?

]]>https://community.m5stack.com/topic/3022/can-t-upload-with-esptool-py-to-m5atom-on-macos-big-surRSS for NodeMon, 04 May 2026 00:25:01 GMTSun, 28 Feb 2021 17:57:40 GMT60<![CDATA[Reply to Can't upload with esptool.py to M5Atom on macOS Big Sur on Tue, 02 Mar 2021 15:33:43 GMT]]>Thanks for the suggestion, @felmue, but I figured out the problem!

The default baud rate of 460800 is too fast for this device. If I specify --baud 115200 (in platformio.ini, that would be upload_speed = 115200) it works.

Maybe this will be useful to someone else in the future.

]]>https://community.m5stack.com/post/12756https://community.m5stack.com/post/12756Tue, 02 Mar 2021 15:33:43 GMT<![CDATA[Reply to Can't upload with esptool.py to M5Atom on macOS Big Sur on Mon, 01 Mar 2021 23:19:13 GMT]]>Hello Dean

according to the description the M5Atom requires an FTDI driver.

Note: I don't have a Big Sur installation, so I cannot tell if that will actually help.

Cheers
Felix

]]>https://community.m5stack.com/post/12741https://community.m5stack.com/post/12741Mon, 01 Mar 2021 23:19:13 GMT<![CDATA[Reply to Can't upload with esptool.py to M5Atom on macOS Big Sur on Mon, 01 Mar 2021 16:36:15 GMT]]>Also, I updated the CP210x Macintosh OS VCP Driver to v6 and that didn't help.

]]>https://community.m5stack.com/post/12736https://community.m5stack.com/post/12736Mon, 01 Mar 2021 16:36:15 GMT