Devices / Makers & open firmware / Prusa MK4 / MK4S / Core One (Buddy firmware)

Prusa MK4 / MK4S / Core One (Buddy firmware) firmware

new version

Latest firmware: 6.10.1
Released: Aug 28, 2026
Category: Makers & open firmware
Last checked: Sep 14, 2026

How to update the Prusa MK4 / MK4S / Core One (Buddy firmware)

Download the .bbf for your exact printer from Prusa's downloads page.
Copy it to a USB drive, insert it into the printer, and confirm on screen.
Update the MMU firmware separately if you have one.

Always download firmware from the manufacturer or project itself. Firmwarely links out; it never hosts firmware.

What changed

Summary New features Support for the new Prusa XL+ Contactless tool offset calibration [XL+] Nozzle thermal expansion compensation [XL/+] Immediate stop on filament runout [6.8.1] Guided calibration order [6.8.1] Filament compatibility checks in more places [6.8.1] Reworked tool mapping screen [6.6…

Manufacturer release notes ↗

Version history

6.10.1	Aug 28, 2026
6.9.1	Sep 10, 2026

FAQ

How do I update the Prusa MK4 / MK4S / Core One (Buddy firmware)?

See the step-by-step above. Follow the project's release page for the flashing or OTA procedure. Many maker devices update from a web installer or the project's desktop app.

How does Firmwarely know when there's a new version?

Every night we read the manufacturer's official release page for the Prusa MK4 / MK4S / Core One (Buddy firmware) and record the version, date and changelog. If anything changed, subscribers watching this device get an email.

Is this an official Prusa page?

No. Firmwarely is independent. Device and brand names belong to their manufacturers; always download firmware from the official source.