Cannot mount DS203 on a linux machine to view saved files

[sashoo]

While working with the original firmware, I tried saving a few .bmp and .csv files, and as the result, memory has soon become corrupt, and DS203 refused to save anything at all. I tried reformatting the internal memory to FAT12, to no avail. And so I decided to reupload the original firmware (at first).
I was following this guide: http://www.seeedstudio.com/wiki/DSO_Quad:Upgrading_Firmware

Then I tried restoring the internal memory using the image file provided in that guide. And my DS203 now writes files without any errors; however, I cannot mount it on my Linux machine to view the saved files. I believe this happened due to the fact that the image file was created from a device with a 2MB internal memory, and I own the 8MB version.

I installed gabonator firmware (I learned that file corruption error is fixed there), and it works fine, and even saves files. However, I still have the same issue: I cannot mount DS203 on a Linux machine to view those files. This is the error I get:

Error mounting /dev/sdj at /media/DSO: Command-line `mount -t "vfat" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush" "/dev/sdj" "/media/DSO"' exited with non-zero exit status 32: mount: /dev/sdj: can't read superblock

Can you provide an image of the internal 8MB memory (made with dd or a similar tool), or do you know of any way to properly reformat the internal memory? Is it actually FAT12, or something else?

Thank you very much in advance.