Hi,

I do not know if I can help, but based on my experiences maybe I can try.

First of all: what system are you using for flashing (Windows, Linux...)?
For me Windows XP SP3 worked best and flawlessly, so I recommend you to try flashing with that (of course I do not state that other ways won't work!!!).
I'm sure you already found this, but I would like to show, just in case: https://wiki.maemo.org/Updating_the_firmware.

I have no clue what the error messages mean, but I found this: http://talk.maemo.org/showthread.php?t=73147.
Or maybe you can take a look at this: https://bugs.maemo.org/show_bug.cgi?id=7433.

For me the random facts mean that something is wrong with the eMMC so that facts won't disappear until you can flash it.

For me the worst case scenario is that something physical is wrong with the eMMC (physical damage for example)...