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Firmware 6.5.6 Removed Already  

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Ruebarb
(@ruebarb)
Estimable Member
Firmware 6.5.6 Removed Already

What the deal? The firmware was released only for a few hours and then taken down.

Core One L MMU3, MK3S

Veröffentlicht : 03/06/2026 2:32 pm
Kachidoki
(@kachidoki)
Estimable Member
RE: Firmware 6.5.6 Removed Already
Posted by: @ruebarb

What the deal? The firmware was released only for a few hours and then taken down.

Arrghh, just updated the whole fleet few minutes ago...

Veröffentlicht : 03/06/2026 2:34 pm
hyiger
(@hyiger)
Famed Member
RE: Firmware 6.5.6 Removed Already

Guess they found a last minute show-stopper bug. @kachidoki you should probably revert. 

Veröffentlicht : 03/06/2026 3:07 pm
Ruebarb
(@ruebarb)
Estimable Member
Themenstarter answered:
RE:

Glad Prusa pays attention to the forum

https://www.reddit.com/r/prusa3d/comments/1tvtw9d/prusa_buddy_fw_656_retracted/

https://www.reddit.com/r/prusa3d/comments/1tvsk49/dont_install_the_github_fw_for_mk4s_from_today/

Core One L MMU3, MK3S

Veröffentlicht : 03/06/2026 4:53 pm
1 weiteren Personen gefällt das
Kachidoki
(@kachidoki)
Estimable Member
RE: Firmware 6.5.6 Removed Already

It looks like the issue is specific to the MK4S. Mine starts up normally, so I’ll wait for the next version.

Version 6.4.2 was released at the same time for the XL. The release notes are brief, but I’ve noticed an improvement in the user interface. When you select tools to rearrange the filaments, the selected print head lights up. But I also found a bug right at the start of the first print, when switching to the left screen, the printer status overlaps the information.

Veröffentlicht : 03/06/2026 5:27 pm
Kachidoki
(@kachidoki)
Estimable Member
RE: Firmware 6.5.6 Removed Already

The first hint from the dev team points to older xBuddy revisions.

Fortunately, since I’ve already sold my first MK4, my oldest remaining printer is an MK4S. Wait'n'see.

Veröffentlicht : 05/06/2026 5:41 am
chmax
(@chmax)
Reputable Member
RE: Firmware 6.5.6 Removed Already

I wonder why Prusa people answers on reddit but never waste a second on their own forum...

Veröffentlicht : 05/06/2026 12:36 pm
1 weiteren Personen gefällt das
Eds_3D_Odyssey
(@eds_3d_odyssey)
Estimable Member
RE: Firmware 6.5.6 Removed Already

 

Posted by: @chmax

I wonder why Prusa people answers on reddit but never waste a second on their own forum...

Hopefully that changes when we get new forum software!!

https://www.printables.com/@Eds3dOdyssey
Veröffentlicht : 05/06/2026 2:56 pm
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