As mentioned previously for further investigation you would need to utilise Linux albeit a Live version upon USB to investigate state of partitions, although unfortunately fact that flasher can't remedy issue points to problems within flash memory. Here are a few resources for further information at which point you may decide that it is not for you, which is completely understandable:
http://wiki.maemo.org/MALF
http://talk.maemo.org/showpost.php?p...2&postcount=53
http://jon.severinsson.net/NemoN9/Ne...structions.txt