The 3 folders being created on the SD-card has nothing to do with the update working or not. The folders are created everytime you insert a fresh card.
From the way you do not seem to be 100% sure if the update was made I am pretty sure it wasn't.
You have to keep the center button pressed once the first boot screen is shown.
You will get a completely new screen that explicitly sais that the firmware is being updated - with a processbar being shown.
It takes a while and you will end up with a completely clean device.
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