Hi,
sorry, maybe I missunderstood someting, but I cannot understand your problem in reading out the whole flash.
1. I have opened / disassembled my Filio 100. And like I have suspected there is a 16GB micoSD card connected (soldered) to the PCB and fixed with glue. One could read out the whole flash in a card reader.
2. You have fully access to the microSD card out of Android:
/dev/block/mmcblk0
sh-4.1# cd /dev/block
cd /dev/block
sh-4.1# pwd
pwd
/dev/block
sh-4.1# ls -l
ls -l
brw------- root root 254, 1 2010-12-07 08:46 dm-1
brw------- root root 254, 0 2010-12-07 08:46 dm-0
drwxr-xr-x root root 2010-12-07 08:45 vold
brw------- root root 179, 17 2010-12-07 08:45 mmcblk1p1
brw------- root root 179, 16 2010-12-07 08:45 mmcblk1
brw------- root root 7, 7 2010-12-07 08:45 loop7
brw------- root root 7, 6 2010-12-07 08:45 loop6
brw------- root root 7, 5 2010-12-07 08:45 loop5
brw------- root root 7, 4 2010-12-07 08:45 loop4
brw------- root root 7, 3 2010-12-07 08:45 loop3
brw------- root root 7, 2 2010-12-07 08:45 loop2
brw------- root root 7, 1 2010-12-07 08:45 loop1
brw------- root root 7, 0 2010-12-07 08:45 loop0
brw------- root root 179, 8 2010-12-07 08:45 mmcblk0p8
brw------- root root 179, 7 2010-12-07 08:45 mmcblk0p7
brw------- root root 179, 6 2010-12-07 08:45 mmcblk0p6
brw------- root root 179, 5 2010-12-07 08:45 mmcblk0p5
brw------- root root 179, 4 2010-12-07 08:45 mmcblk0p4
brw------- root root 179, 3 2010-12-07 08:45 mmcblk0p3
brw------- root root 179, 2 2010-12-07 08:45 mmcblk0p2
brw------- root root 179, 1 2010-12-07 08:45 mmcblk0p1
brw------- root root 179, 0 2010-12-07 08:45 mmcblk0
sh-4.1#
Regards, Artem