<![CDATA[Upload error w Arduino IDE - A fatal error... Timed out waiting for packet header]]>Hi M5Stack C sitting on win 10 (Dell XPS 15), COM5. EasyLoader looks to connect and work fine. But, Arduino IDE runs into this problem when trying to upload a sketch("Hello World").

I have tried different things, like connecting GND-G0 and 3V3-G0. No success.

Messages:
Sketch uses 254233 bytes (19%) of program storage space. Maximum is 1310720 bytes.
Global variables use 16676 bytes (5%) of dynamic memory, leaving 311004 bytes for local variables. Maximum is 327680 bytes.
esptool.py v2.6
Serial port COM5
Connecting.....
Chip is ESP32-PICO-D4 (revision 1)
Features: WiFi, BT, Dual Core, 240MHz, Embedded Flash, VRef calibration in efuse, Coding Scheme None
MAC: d8:a0:1d:56:47:60
Uploading stub...
Running stub...
Stub running...
Changing baud rate to 921600
Changed.
Configuring flash size...

A fatal error occurred: Timed out waiting for packet header
A fatal error occurred: Timed out waiting for packet header

]]>https://community.m5stack.com/topic/1689/upload-error-w-arduino-ide-a-fatal-error-timed-out-waiting-for-packet-headerRSS for NodeThu, 14 May 2026 04:16:26 GMTSun, 09 Feb 2020 20:00:43 GMT60<![CDATA[Reply to Upload error w Arduino IDE - A fatal error... Timed out waiting for packet header on Wed, 12 Feb 2020 06:45:05 GMT]]>Hi， you should selcet M5StickC board in ther board manager. or seting the baud rate to 115200

]]>https://community.m5stack.com/post/7360https://community.m5stack.com/post/7360Wed, 12 Feb 2020 06:45:05 GMT<![CDATA[Reply to Upload error w Arduino IDE - A fatal error... Timed out waiting for packet header on Wed, 12 Feb 2020 05:50:10 GMT]]>Have you tried changing the baud rates?
There are many reasons for the timeout.

]]>https://community.m5stack.com/post/7359https://community.m5stack.com/post/7359Wed, 12 Feb 2020 05:50:10 GMT<![CDATA[Reply to Upload error w Arduino IDE - A fatal error... Timed out waiting for packet header on Tue, 11 Feb 2020 04:10:18 GMT]]>That isnt a big trouble.A photo about it is helpful...
you can try to dissconnect from your USB port and then reconnect and upload.Do not touch the line while you are uploading.
I think you touched the USB line while uploading.

]]>https://community.m5stack.com/post/7346https://community.m5stack.com/post/7346Tue, 11 Feb 2020 04:10:18 GMT