MMU2 Firmware update issue
I just updated my MK3S to the 3.13.3 firmware successfully. When that completed I got a message saying that the MMU2's firmware is no longer compatible, and to update to 3.0.2. Now, when I try to flash the MMU2 to 3.0.2, it can't seem to find the device.
I found this thread, which seems to describe similar issues, but the resetting solution that was suggested there didn't work for me: https://forum.prusa3d.com/forum/original-prusa-i3-mmu2s-mmu2-hardware-firmware-and-software-help/firmware-update-problem-after-mmu3-upgrade/
Lastly, I'm not sure if this is an important detail, but when the first dialog box comes up after I select Update Firmware in Prusa Slicer, the Prusa device I see listed next to the com port is Prusa MK3S with no mention of MMU2. Did I flash the wrong MK3S firmware and now the printer no longer "knows" I have an MMU connected?
Anyone else having this problem or have any suggestions?
RE: MMU2 Firmware update issue
Is this the firmware that you loaded? 
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
RE: MMU2 Firmware update issue
No, it was this one:
RE: MMU2 Firmware update issue
try the other one.
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
RE: MMU2 Firmware update issue
Ok will do, thanks so much!
RE: MMU2 Firmware update issue
Had exactly the same problem. After successfully flashing MK3S+, the firmware for MMU2S could not communicate (find) the Computer USB port and the flash failed. Restarted the MK3S+ and reconnected the computer to the MMU2S and It communicated and flashed just fine.
RE: MMU2 Firmware update issue
Thanks. I will try this out when I'm back at my printer tonight!