How to upgrade the firmware of a Prusa MK3S+ with a Revo6 HotEnd

Disclaimer: I'm new to the whole 3D-Printing world. I've researched for quite a while and decided for a used and modified Prusa MK3S+ I got from Kleinanzeigen.de. I could have gotten a Bambu Labs printer, but I did not like the last news on their updated firmware.

I wanted to upgrade the firmware of my new (used) Prusa MK3S+. I managed to install a new firmware I downloaded from the official website, but any time I tried to unload the filament or do a thermal calibration, I got a "Thermal Anomaly" error.

After a bit of searching, reading GitHub issues and asking Mistral AI, I found out that there is a special firmware for this model when using the Revo6 HotEnd, which I did not see on the official website. You have to look in the GitHub Repository, under releases.

At the time of writing this, the last available firmware is the 3.14.1. There you have to choose the one starting with E3D_REVO.

That will download a zip file with several files in it. I used "MK3S_MK3S+-E3DREVO_FW_3.14.1_MULTILANG.hex"

I flashed the new firmware with Prusa Slicer -> Configuration -> Flash printer firmware. After a couple of minutes it said that the flash process was ready.

After that the printer worked again and I didn't get any "Thermal Anomaly" error. I could unload the filament and do a Thermal Calibration (which took a while).

Now I am fighting with the bed and nozzle calibration (Z Axis). It should be easy, but the filament (a Silk PLA) is not correctly adhering itself to the bed.

I also just now remembered that "Filament Humidity" is a thing in 3D printers, so I will dry the PLA and try again later. Maybe that solves the issue.