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Firmware 6.4.1 Failure  

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jadoglio
(@jadoglio)
Member
Firmware 6.4.1 Failure

Title: Second time having to downgrade 5T XL from 6.4.1 back to 6.2.6 — This is getting ridiculous

Post body:

This is now the second time I’ve had to roll back my 5-tool Prusa XL from firmware 6.4.x to 6.2.6.

First upgrade → constant nozzle cleaning failures. Second upgrade → bed leveling failures that make the printer unusable.

I clean the nozzles properly, I do dock calibrations, tool offsets, the whole routine — and it still fails on basic bed leveling that used to work flawlessly (and is again since reinstalling) on 6.2.6.

6.2.6 has been rock solid for me. 6.4.x is not. At this point the 6.4 branch feels like it was rushed and poorly tested on the 5-tool XL.

Prusa — the firmware team really needs to get their act together on the XL. This is your flagship multi-tool printer and multiple 5T owners are stuck on old firmware because the new one is unreliable. This level of regression is not acceptable for a $4k+ machine.

Anyone else still stuck on 6.2.6 because of these issues?

Posted : 30/05/2026 10:24 pm
FoxRun3D
(@foxrun3d)
Illustrious Member
RE: Firmware 6.4.1 Failure

Zero issues with 6.4.1 here. 

Formerly known on this forum as @fuchsr -- https://foxrun3d.com/

Posted : 01/06/2026 2:27 pm
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