cmflorea, if dasilvarsa's above post(# 71) doesn't help test the archive(s) of the map and JCV files to make sure they're good.
If you fine one bad set(map or jcv) I'd re-download all the corresponding files.
Secondly, if the archive(s) test good, I'd re-copy them to the device and attempt again. It could very well have been, after knowing the archives tested good, that it was simply due to a possible transference glitch happened when first copied over. Like the file system hadn't properly finished writing before you unplugged it from the usb/computer.
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