Cant flash MMU fail to connect - Hardware, firmware and software help https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/cant-flash-mmu-fail-to-connect/ Prusa3D Forum Discussion Board en-US Mon, 08 Jun 2026 02:50:05 +0000 wpForo 60 RE: Cant flash MMU fail to connect https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/cant-flash-mmu-fail-to-connect/#post-602441 Sat, 16 Apr 2022 04:07:33 +0000 Try hitting the reset button on the mmu and then, as quick as you can, click the flash button in PrusaSlicer. 

]]> Hardware, firmware and software help ZombiPach https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/cant-flash-mmu-fail-to-connect/#post-602441 Cant flash MMU fail to connect https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/cant-flash-mmu-fail-to-connect/#post-602207 Thu, 14 Apr 2022 09:54:14 +0000 I have flashed the mmu before no problem but now it wont connect? 

 

 

avrdude-slic3r -v -p atmega2560 -c wiring -P COM6 -b 115200 -D -U flash:w:0:C:\Users\kent\Downloads\prusa3d_fw_3_11_0_MK3S_1_0_6_MMU2S\prusa3d_fw_MK3S_MK3S+_3_11_0_4955.hex:i

avrdude-slic3r: Version 6.3-20160220-prusa3d, compiled on Mar 10 2022 at 11:54:26 Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/ Copyright (c) 2007-2014 Joerg Wunsch

Using Port : COM6 Using Programmer : wiring Overriding Baud Rate : 115200avrdude-slic3r: stk500v2_recv(): timeoutavrdude-slic3r: stk500v2_getsync(): timeout communicating with programmeravrdude-slic3r: Could not open port: COM6

avrdude-slic3r done. Thank you.

 

]]> Hardware, firmware and software help kentthoresen https://forum.prusa3d.com/forum/original-prusa-i3-mk3s-mk3-hardware-firmware-and-software-help/cant-flash-mmu-fail-to-connect/#post-602207