The error is that I don't see the external SD card of 16 GB in the Settings, just the internal one of 5.5 GB ( it's split in 2 - the other part of 2.5 GB is for the rom or something else ). I can access it ( external SD ) through File Explorer, but I can't move any app on it from App Manager. For example, if I want to format it, I think that I need to do that from the computer, because I can't see it in the Settings ...