Notifications
Clear all

Can't get MMU3 firmware installed for MMU2S  

  RSS
RepRogue
(@reprogue)
Member
Can't get MMU3 firmware installed for MMU2S

The MK3S firmware upgrade to 3.13.0 worked, but I just can't get the MMU2S firmware to upgrade. I tried both prusa3d_fw_MMU3_3_0_0.hex (from the prusa site) and MMU3_3.0.0+814.hex (from github). When I select the Flash Printer Firmware option in PrusaSlicer 2.60, the MMU2S is selectable in the Serial Port dropdown, but whenever I select the Firmware image in the Firmware Flasher dialog, the Serial Port setting immediately switches to Autodetect and the flash fails. I tried multiple USB ports (both 2.0 and 3.0), but nothing works.

This is incredibly frustrating. Updating firmware should be one of the most simple things to do.

What am I missing? Thanks for any help.

Posted : 07/08/2023 7:25 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Can't get MMU3 firmware installed for MMU2S

Have you disconnected the printer USB Cable, before trying to flash the MMU? 
If that doesn't work, try pressing the MMU reset button when you try loading the MMU Firmware!

 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 08/08/2023 9:06 am
Hello
(@hello)
Noble Member
RE: Can't get MMU3 firmware installed for MMU2S

I may be wrong but from mmu first receiving power within the first 10 seconds of it receiving power you have to attempt to flash firmware to keep it in bootloader mode so select firmware file and auto detection port as soon as you flick power on for printer press update firmware 

Please help me out by downloading a model it's free and easy but really helps me out https://www.printables.com/@Hello_474427/models

Posted : 08/08/2023 9:53 am
RepRogue
(@reprogue)
Member
Topic starter answered:
RE:

@JoanTabb @Hello - Thanks for your replies.

I think I figured the problem out (finally) and I think it's a bug in PrucaSlicer. For some reason the COM5 port is forced for the MMU, which is also the Autodetect default. So if the COM5 port is unavailable, the firmware won't flash. To try this, I  borrowed a laptop without any peripherals attached. In the Firmware Flasher dialog, the Serial Port setting immediately switched to Autodetect again, but this time the flash was successful, because COM5 was available for the MMU. It's strange behavior with the MMU only, because the printer itself doesn't have this issue. Anyhow, it's working now.
Oh, in case you haven't guessed, I'm using Windows... 🙄 ...so it could also be some other obscure reason.

 

This post was modified 7 months ago 2 times by RepRogue
Posted : 08/08/2023 12:52 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Can't get MMU3 firmware installed for MMU2S

Glad to hear you sorted the issue!

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 08/08/2023 1:25 pm
Share: