Hi ElsieC,
root of the problem is trying to install PRS+ on non-US (unsupported) firmware. (It is causing too much problems so I'll probably remove it from the installer altogether)
Recovering internal memory errors normally takes more than one try (assuming it is purely software based and not hardware failure).
Prior to doing format/checkdisk, please reboot the reader (by either shutdown or reset) and (IMPORTANT) while it is starting, connect it to USB. This guarantees there are no open files in internal memory so checkdisk or format should succeed.
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