r/prusa3d•
jamcber12

Firm Ware Update now it's locked up.

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I received a message on my LED screen that there was a "Firm Ware Update"

I added the updated to my thumb drive for the MK4S, and I also saw an update for the MMU, which I added.

Now my printer says, "Can't enable MMU: calibrate and enable the printer's filament sensor first."

I've tried to find a way to calibrate it, but the information that I'm getting to fix this, I do have the feature on my LED screen.

Need help with this!

Posted Jun 7, 2026, 4:45 AM UTC

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