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6.4.0 Firmware for Prusa XL  

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jan.d.slay
(@jan-d-slay)
Reputable Member
RE: 6.4.0 Firmware for Prusa XL

Hello.It was about time!

I wish you every success in fixing the countless bugs and releasing a stable follow-up firmware!

I also hope that the software for the Core One will be revised as well. (Yes, I know this is a Prusa XL post.)

Mods for Core One: Core One HT 450 degrees, Comfortable display , Very fast print start and Reducing noises
Mods for Prusa XL: Very fast print start

Napsal : 05/02/2026 5:59 am
Jan Kratochvíl
(@jan-kratochvil)
Member Admin
Topic starter answered:
RE: 6.4.0 Firmware for Prusa XL

Put version 6.2.6 on the flash drive, insert it into the printer, and start the printer. While booting, rotate or repeatedly click the knob. The screen prompting to install 6.2.6 should appear.

Napsal : 05/02/2026 6:11 am
Gerald
(@gerald-6)
Active Member
RE: 6.4.0 Firmware for Prusa XL

Bonjour 

Un grand merci a vous, vous venez de me re donner confiance en ma XL. Oui elle fonctionne parfaitement avec la V 6.2.6, mais j avait vraiment impatience que cette V6.4.0 soit installé car je reste convaincu que les améliorations prévues seront vraiment bénéfique. On attend de vos nouvelles avec impatience .  bonne journée à vous 

Napsal : 05/02/2026 8:56 am
1 lidem se líbí
Prune
(@prune)
Active Member
RE: 6.4.0 Firmware for Prusa XL

at last ! 

To downgrade: https://help.prusa3d.com/downloads/xl

Keep up, Prusa, we know you can do better !

Napsal : 05/02/2026 1:58 pm
1 lidem se líbí
Jazon Clark
(@jazon-clark)
Member
RE: 6.4.0 Firmware for Prusa XL

 

Posted by: @jan-kratochvil

Hello.

 

Based on your feedback and the reports we’ve received, we’ve decided to withdraw firmware version 6.4.0 for the Original Prusa XL. The main issues are related to Phase Stepping calibration.We are currently working on a fix, which should be available in the coming weeks.

If you are experiencing Phase Stepping issues (noise), layer shifts, or random tool crashes, please downgrade to the latest stable firmware version, 6.2.6.

These issues affect only the Original Prusa XL. If you’re running firmware 6.4.0 on your MK4 or CORE One, there is no need to downgrade.

hola Jan Kratochvíl, 

Is there still no release date for firmware 6.4.0?

Could you send me the discontinued firmware 6.4.0? My Prusa XL was working fine, but I had problems with the motherboard. I ordered a new replacement and would like to install the same version.

Napsal : 03/03/2026 3:01 pm
jan.d.slay
(@jan-d-slay)
Reputable Member
RE: 6.4.0 Firmware for Prusa XL

Is there still no release date for firmware 6.4.0?

Do you want the new firmware for testing?

https://github.com/prusa3d/Prusa-Firmware-Buddy/releases/tag/v6.4.1-beta

Mods for Core One: Core One HT 450 degrees, Comfortable display , Very fast print start and Reducing noises
Mods for Prusa XL: Very fast print start

Napsal : 03/03/2026 4:50 pm
Jazon Clark
(@jazon-clark)
Member
RE: 6.4.0 Firmware for Prusa XL

Excellent. Thanks 

Napsal : 03/03/2026 4:53 pm
1 lidem se líbí
BullDog8484
(@bulldog8484)
Active Member
RE: 6.4.0 Firmware for Prusa XL

Testing 6.4.1RC on one of my two XL's. So far, so good. Time will tell. Homing seems to be better. No crashes so far. Quieter!

Napsal : 04/03/2026 12:19 am
Laminar Tom
(@laminar-tom)
Member
RE: 6.4.0 Firmware for Prusa XL

Also testing 6.4.1RC and oh my how I missed a quiet machine.  So far so good also.

Napsal : 04/03/2026 3:22 am
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