I just picked up one, used and it is currently running version 2.4.6. How old is this version? Also, when I try to flash using the SD card slot in the back (pins pointing up) nothing happens. I don’t get a click when putting the card in, Power off, wait 10 seconds, power back on in the back, initiating message comes up and back to the default screen. what am I missing? thank you and sorry for the newbie questions.
I don’t remember the exact age of that version but it is pretty old. How big is the SD card you’re using?
Hallo, the 2.4.6 is not the latest; now is avaiable the 3.0.4 version; https://www.psaudio.com/support/downloads/
but, in my case, was not working (Scott form PS Audio, very kind, said that they were fixing the update problems of the 3.0.4 version; maybe, now, they solved).
Scott suggest to use an SD card that is 8GB or smaller and to format as FAT32, uploading files one by one. In my case, it worked.
Bye 
It was the one file at a time thing that did it. I tried the card (4GB) and still nothing and last thing to try, one file at a time and bingo, it is flashing the unit. thank you.
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Great! Now, enjoy the music 
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Very odd, any explanations why one file at a time?
…unless the files weren’t unzipped and copying one at a time was forcing an unzip on the fly
I cannot explain, it doesn’t make sense to me. All I know, and maybe it was coincidence, is that I formated the 4GB card and moved all the files together to the card from an unzipped folder, tried it and nothing, I then deleted all the files and moved one by one to the card and bingo, the flash started the second I turned the unit back on. I am now running the latest version. Side note, this DAC is amazing, it replaces a Mcintosh D150. It is more details with a sound stage that completely fills the room, also amazing, well controlled bass. Couldn’t be happier.