Firmware updating (MINI/MINI+) | Prusa Knowledge Base

On the MINI you flash the firmware using a USB flash drive.

Download the Zip file for the firmware and extract it on your computer.
Copy the .bbf file in your chosen language to the root directory of a USB flash drive (Not within a folder). All files have the English language, and if all files are added, the chosen languages will be English and Czech.
Insert the USB flash drive and push the reset button. The bootloader will automatically compare the installed version with the one on the drive and, if newer, will automatically offer you to flash it.
Confirm the update by selecting the "FLASH" button and pressing the knob.

If you have received the error "Firmware in the internal flash corrupted" use the alternative method below.

Updating from firmware pre-4.4.0

Starting from firmware, 4.4.0, the MINI+ has a new bootloader. This might cause some trouble when updating the firmware to version 5.1.0 and above. In this case, download firmware 4.4.0 or 4.4.1. The downloaded folder will have two files. Flash the printer firmware with the two files in the USB drive. After that, flash the latest firmware as usual.

Alternative method - older firmware release

It is not possible to flash to the same, or an older version of the firmware release, using the method above. To flash an older firmware the procedure is as follows:

Push the reset button, immediately followed by double-pressing the selector knob.
On the new screen, confirm the update by selecting the "FLASH" button and pressing the knob.

If it repeatedly only boots the printer and gives you the home screen try to format your USB flash-drive or try a different one. Even if the flash drive works with G-Codes and printing, it may not work for flashing the firmware.

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26 comments

Marc3D

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Ondertussen is het gelukt om update 4.4.1 te plaatsen, na deze te downloaden op de laptop, de update-map geopend en de twee verschillende bladen AFZONDERLIJK te kopieëren naar een nieuwe en geformateerde Usb-stick(8GB). De stick in de printer geplaatst, printer aangezet en het scherm met flach-knop verscheen knop vlug ingedrukt en de update starte.Instalatie gelukt(dit duurt wel even). Nadien de nieuwste firmware gedownload op de computer. nu enkel blad met Engels- tsechisch gekopieerd naar zelfde usb stick .Stick geplaatst in de printer, printer aangezet en weer de knop flach ingedrukt, deze update ging sneller.

Marc3D

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Geeft iemand een duidelijke werkwijze om de prusa mini up te daten ? Heb al de hele dag vanalles ( nieuwe usb-stick, geformateerd, gereset, ook ubdate naar 4.4.1 lukt niet )geprobeerd, niets blijkt te werken, ook met de live chat geraak ik er niet uit. Graag had ik de printer nog gebruikt, nog maar 70uur mee geprint.

rtorstrick

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I've tried at least 20 times using 3 different USB drives, and all I ever get is the normal startup screen. Is there anything else I can try?

ceallachan

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Sorry to tack myself on, but same. Bootloader 1.0.0, Mini version 4.3.1

Daniel Glauber

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I'm having the same problem. I have version 4.3.4 and have tried updating to 4.4.0 and 4.4.1 with the new bootloader, but it has no effect. I reformatted the flash drive, removed all files except the 4.4.0 bootloader and the latest 4.4.0 firmware, and it still won't detect the bootloader file or the 4.4.0 firmware. It's very frustrating. Can someone help please?

DKAS

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Have you tried the alternative method reset button + 2x pushing selector knob?

If you do and printer still won't perform flashing sequence, please contact our customer support.

statusfailed

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I had exactly the same problem: version 4.3.4 wouldn't update to 4.4.1.

I tried David Kašpar's solution, but it didn't work: I would get a red "wrong size" error at boot.

Here is what worked for me:

- Blank 8GB USB formatted to FAT32
- Add ONLY the file `Buddy_update_pre_4.4_4.4.1+4194.bbf` from the 4.4.1 update
- Boot MINI+ (I didn't need the 2x selector knob trick)
- Wait until MINI+ starts showing "Updating bootloader" and "looking for BBF..." one after the other
- Turn off the MINI+
- Add the other file `Buddy_4.4.1+4194.bbf`
- Reboot again
- Update should complete

Hope this helps!

Observatus

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The reset button plus press the button twice quickly worked for me. I went from my first generation firmware to 6.2.2. But the temperatures seem to be the same that they were before but now the filament is not adhering to the platinum or the print sheet. I checked the temperatures in the slicer, G code, and printer settings, and the temperatures look right on the display as it's preparing to print. But still the same filament that worked before does not work now. Any advice would be greatly appreciated. I've tried three different brands of PLA filament also.

Tomáš Vodislavský

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I have a version 2 bootloader on the printer and I downloaded firmware 6.00 there, the screen flashes white after updating the new firmware. I tried to put a new bootloader there with version 4.00 but it didn't work.

Jan Kratochvíl

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Hello Tomáš. The last firmware version for the MINI, which requires a separate bootloader, is 4.4.1. Please attempt to flash your printer with version 4.4.1 (including the bootloader provided on your GitHub: https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v4.4.1). After that, update it to firmware version 5.0.0, and then proceed to install the latest firmware on the printer."