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Nodak7
(@nodak7)
Eminent Member
Firmware Update

Help! I updated the Firmware on my MK4S (with MMU3) to "Firmware 6.5.3 (3.0.4) MK4S, MK4, MK3.9S, MK3.9". After I did that I get an error on my printer that the MMU is not compatible with this firmware. I looked at the website under the MMU  and the update is the same name and size. What am I doing wrong? Should I just revert back to the old Firmware?

Publié : 06/06/2026 2:32 pm
FoxRun3D
(@foxrun3d)
Illustrious Member
RE: Firmware Update

Did you update the MMU firmware too? With a USB cable from Prusalicer. 

Formerly known on this forum as @fuchsr -- https://foxrun3d.com/

Publié : 06/06/2026 4:08 pm
Nodak7
(@nodak7)
Eminent Member
Topic starter answered:
RE: Firmware Update

It does not say anything about that in the MMU Firmware update write up .. How do you do that?

 

Publié : 06/06/2026 4:22 pm
FoxRun3D
(@foxrun3d)
Illustrious Member
RE: Firmware Update

https://help.prusa3d.com/article/how-to-update-firmware-mmu3_701584

 

It's a pain in the rear end — you need a laptop (or printer next to a desktop) and a MicroUSB cable — with the first one I tried Prusaslicer didn't recognize the printer.

 

 

Formerly known on this forum as @fuchsr -- https://foxrun3d.com/

Publié : 06/06/2026 4:46 pm
Nodak7
(@nodak7)
Eminent Member
Topic starter answered:
RE: Firmware Update

Thank you! That led me to what I needed to know! I got it. And yes the orginal cable is needed. What a pain! I tried another longer cable but that did not work. I found the original cable it it worked like a charm. Now everything is updated. Thanks again!

Publié : 06/06/2026 4:57 pm
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