Serialhdl.error: mcu 'mcu': Serial connection closed

General Discussion
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EBRO_dmesg_doc.txt (42.0 KB)
klippy (Ebro).log (73.6 KB)

Printer Model: Ender 3S1
MCU / Printerboard:STM32F103
RPI4B Updated

Hi, since the update, i did the patch and the things needed to make klipper work again with my printer. After a couple of prints, i decided to reinstall a BME280 i already installed and work fine in the past. When i restarted the PI after reinstall the sensor, i got an error. that I have a old version of klipper on my printer. So, I remake the klipper.bin file with my new klipper version and flash the printer. Well, I’m not able to make it work… So, I need help. @Sineos, I join a KLIPPY.LOG and the output of sudo dmesg you ask me. I don’t know if i did it right, so, i will wait some comments.
Today, 2023-06-27, i reinitialised my PI with klipper and mainsail. I re-flashed my printer and i still have the same issue… I really need help…
Thanks for your help.

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Well! I got it!! Finally, it’s the flash of the firmware which was not done properly. I had to flash with a different firmware name and then take the firmware.bin name after. And the issue is solved. If it can help somebody.

1 Like
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Hi, I am running in a similar issue I think. can you explain what do you mean with this?

How can you flash with a different firmware name, when the mainboard needs the file to be named “firmware.bin”