Trying to do a back up before updating. Starts process then gives me the message 'an error occurred while reading the file G:\system'. Get same message if I try to update. On version 7.161 Tomtom one with internal memory only. Thanks in anticipation. Now showing 'this file does not exist G:\ephem\ee_meta.txt' but I can see this file in the tomtom when I try to open it it says is corrupt.
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