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did you find a solution? I have had an elliepal for quite some time, and i started only downloading the firmware updates on macs, because when i downloaded them on a windows pc, it would do just as you stated. but with me, its always at 99%. Well i got ellipal as gift for my brother, and he is having the same problem. And he doesnt have access to a mac. I am trying to figure out the solution on my pc right now, because i no longer have a mac either.
i made sure there where no hidden files on the sd card. i formatted the sd card for fat32 with 32gb. i even uncheck the „quick format“ option thinking maybe that was the problem.
I am now trying again, this time when downloading, i turned of virus protectioni on my google browser. thinking maybe that is doing something with the file?
Did you have any luck? If you search for this you will see a bunch of this problem, and no solution is ever stated. So if you get it figured out, please post the solution, i will do the same.