Quote:
Originally Posted by Alicesays
(Sorry to update an old thread but I don't find it useful to open a new topic)
Yesterday I tried to downgrade my Kobo Glo 3.8.0 to 2.5.1 and I did everything correctly - downloaded the official firmware, pasted it in the correct .kobo folder, ejected - but after updating, the screen kept stuck on the black dots forever. Luckily I could hard reset it and go back to 3.8. Did that happen because my Kobo Glo is the model N613? I don't understand why that could be a problem though.
I tried again this morning and the same happened. I wish I could go back to the old UI from the 2.5.1 firmware 
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Going back to an earlier firmware version, I'd recommend doing a factory reset and then upgrading to the version you want to use. There are changes made during the updates so the factory reset undoes those changes.
So:
1. Factory reset
2. Connect to your computer and go through the Kobo setup. When it is done, do
not eject your ereader.
3. Open the .kobo directory on your Glo, delete the upgrade directory and the KoboRoot.tgz and manifest.md5sum files.
4. Copy the directory and files from inside the firmware .zip file you downloaded into the .kobo directory and then safely disconnect/eject it from your computer. Unplug the USB cable and it should update to the version you sideloaded.
Personally, I now prefer the newer UI and the added features but à chacun son goût.
Regards,
David
Usual disclaimer: replace directory with folder if that's your preference.