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6.5.3RC and MMU  

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spamplin
(@spamplin)
Eminent Member
6.5.3RC and MMU

Just upgraded my MK4S + MMU3 to 6.5.3RC and now cannot use it as it says its incompatible with the firmware on the MMU3 - thats fair enough but can I find where a compatible version for the MMU is? no ! Anyone point me in the right direction please or do I have to wait for the official release version. 

Posted : 23/03/2026 4:04 pm
miroslav.h4
(@miroslav-h4)
Prominent Member
RE: 6.5.3RC and MMU

The correct FW 3.0.4 for MMU is here:

https://github.com/prusa3d/Prusa-Firmware-MMU/releases/tag/v3.0.4

The FW is not marked as stable but it works.

Posted : 23/03/2026 5:44 pm
Zwirbel
(@zwirbel)
Member
RE: 6.5.3RC and MMU

The final firmware 6.5.3 is now here: https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.5.3 and you will need to update both the firmware of your MK4S and of the MMU3 as described in the release notes. Then it will work.

Posted : 25/03/2026 3:25 pm
Ian.bradbury
(@ian-bradbury)
Member
RE: 6.5.3RC and MMU

Good luck getting good prints after the upgrade - I'm getting terrible layer shift on every-single-print since I upgraded.

Posted : 14/04/2026 6:43 pm
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