The simple answer is: you cannot mount it
)
The only thing you can do is accessing /dev/mmcblk2 directly with dd.
This gives you lot's of options to destroy it.
The first 24MB of mmcblk contains many things - device serial, encryption keys, bootloader etc.
You need to know the correct offset and size of the potion you want to access. (see here for reference:
https://www.mobileread.com/forums/sho...54&postcount=2)
For the pastlog area, the fix is described in the link I gave you.