RE: Firmware update issue: avrdude has no access to COM port
Just had the same Issue on Win 11, and for me the following steps solved it:
- Open Device Manager
- Expand the Menu on "Ports (COM & LPT)"
- Double-click "Original Prusa i3 MKS (COM..)
- Go to tab "Driver" and choose "Uninstall Device"
- In the pop-up box make sure to check "Try to remove drivers" and click "ok"
- In the menu of the Device Manager, click on "Acton", then choose "Scan for hardware changes", your Printer Driver will now be reinstalled new
- Go back to Prusa Slicer and Flash your Firmware
Cheers
e.g. John
RE: Firmware update issue: avrdude has no access to COM port
great thanks, it helped! I changed the port from 3 to 20 and the firmware loaded correctly.
Thank a lot!!! SK-Jan
RE: Firmware update issue: avrdude has no access to COM port
Please help, I am unable to flash my printer's firmware.
I tried uninstalling the device from Device Manager and changing the COM-Port. (Win11 Pro)
I tried different USB cables and USB ports on my PC
I even tried once from a linux laptop with Prusa Slicer (installed from flathub if that matters).
All I get is this:
avrdude-slic3r -v -p atmega2560 -c wiring -P COM20 -b 115200 -D -U flash:w:0:E:\Install\Firmware\Prusa\MK3S_MK3S+_FW_3.14.0_MULTILANG.hex:i avrdude-slic3r: Version 6.3-20160220-prusa3d, compiled on Sep 18 2024 at 15:59:20 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2014 Joerg Wunsch Using Port : COM20 Using Programmer : wiring Overriding Baud Rate : 115200 avrdude-slic3r: stk500v2_recv(): timeout avrdude-slic3r: stk500v2_getsync(): timeout communicating with programmer avrdude-slic3r: Could not open port: COM20 avrdude-slic3r done. Thank you.
RE: Firmware update issue: avrdude has no access to COM port
Update: I followed the steps described here: https://help.prusa3d.com/article/firmware-updating-issues-mk2-5s-mk3s-mmu2s-mmu3_2225 and checked the fuses. I did not perform the multimeter tests, as all other functions are working just fine.
I did a self test, which it passed.
When I connect my RPi with Octoprint via USB, I can connect and control the axis and temperatures.
The RPi Port is disabled.
According to the Troubleshooting Guide, all that's left is performing a factory reset. Which I would like to avoid if possible.
Oh, and it's a MK3S currently on version 3.13.2-7080. Didn't mention that in my first post.
RE: Firmware update issue: avrdude has no access to COM port
Turning off bluetooth solved the issue for me. Bluetooth was occupying the same port (COM3).
RE: Firmware update issue: avrdude has no access to COM port
Can confirm. Try to disable Bluetooth (for me, the Bluetooth possibly conflicting COMM port was actaully listed as a second item in the COMM port drop down with the same port number) and if that doesn't do the trick, try to uninstall Prusa printer in the Device manager and after that unplug and plug it back again.