https://forum.prusa3d.com/forum/ Prusa3D Forum Discussion Board en-US Sun, 07 Jun 2026 01:46:41 +0000 wpForo 60 https://forum.prusa3d.com/forum/english-forum-general-discussion-announcements-and-releases/firmware-update-10/ Sat, 06 Jun 2026 14:32:21 +0000 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?

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