Prusa MK4S, XL and Core One (Buddy firmware)
new versionFirmwarely tracks 3 Prusa models on this firmware, under makers & open firmware: MK4 / MK4S / Core One (Buddy firmware), MK4S and XL. The latest firmware, 8.0.1, shipped on Nov 3, 2026. Firmwarely has recorded 5 versions since Aug 28, 2026.
- Latest firmware
- 8.0.1
- Released
- Category
- Makers & open firmware
- Last checked
- Models
- 3
Models
| Model | Version | Date | |
|---|---|---|---|
| MK4 / MK4S / Core One (Buddy firmware) | 8.0.0 | Track | |
| MK4S | 8.0.0 | Track | |
| XL | 8.0.1 | Track |
How to update the Prusa MK4S, XL and 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 Fixed nozzle temperature swings and thermal runaway errors [MINI/+] Fan Test no longer fails on a print fan spinning faster than 7000 RPM [XL/+] This is the stable release of firmware 8.0.1 for the Prusa XL+, XL , MINI+ and MINI , bringing two targeted fixes. Firmware 8.0.1 follows firmware…
Version history
| 8.0.1 | |
| 8.0.0 | |
| 6.10.3 | |
| 6.10.2 | |
| 6.10.1 |
FAQ
What is the latest firmware for the Prusa MK4S, XL and Core One (Buddy firmware)?
Version 8.0.1, released Nov 3, 2026. This page is refreshed every hour from the manufacturer's release page.
How do I update the Prusa MK4S, XL and 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 hour we read the manufacturer's official release page for the Prusa MK4S, XL and Core One (Buddy firmware) and record the version, date and changelog. Subscribers watching this device get an email when it changes: the next morning on Pro, in the Monday roundup on the free plan.
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.
Get alerts for Prusa MK4S, XL and Core One (Buddy firmware)
One email when new firmware or a security fix ships: weekly and free for up to 3 devices, daily on Pro.