Quote:
Recommended way to install PRS+ on 505 is to "downgrade" to US version using standard sony updater (you can find it renamed to "Uninstaller" on the project site) that installs 1.1. 0.18040.
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Try this
link.
Was already mentioned some post above too.
Plus do the CHKDSK thing (assuming you are on a Win-Box).
To do so, press reset, connect reader to USB and power up.
Device will show up as external drive in explorer.
right click, properties, extras Checkdisk (not sure what are the exakt terms in UK Windows, as I'm using a german localised one) check now and tick the correct errors box, afterwards shutdown or reset your PRS-505 and redo this.
HTH
Mark