Samsung Galaxy Tab3 tablet comes with the excellent Readers Hub. An update Version 130731.02 has appeared dated 13 August 2013, which the tablet's security blocks as the update comes from an unknown source. The update summary is in chinese(!), and I am loathe to switch off the security block. Meanwhile Readers Hub cannot be used as the system will not bypass the update. Am I correct in refusing to permit the update? If so how can I get rid of it? I am sending this from my PC since a Google search for Readers Hub would not succeed on my tablet - it recognised "Readers Hub" and merely took me to the app on the tablet (too clever by half?).