Hello, since this is one of the only place talking about that issue when searching on google, I just want to add an information for future readers.
I have a Vivlio Inkpad 3 on which I installed the Pocketbook firmware v.5.20.1010 and a 128gb microSD card.
When formatting the microSD card to "large FAT32" with
Rufus or Windows partitionner or even any formatter out there with the card in the e-reader and refreshing the device after the process, everytime the card was just recognized as a 100mb one.
It only worked when I used the adaptater delivered with the card to format it with Rufus.
Not sure if this is because I needed to take the card off and put it back in or because I used the adaptater, but anyway if you are struggling to make it work you might want to try that
