Thanks for the tips. I need to read the following posts slowly then, too much information there:
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Photos inside the Pocket Edge
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PE Hardware serial console
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A Thread for Vicinc's Device (bad blocks, bad sectors in internal memory (/sdcard) )
Before doing anything of the above I was able to move the Internal Storage from the Internal Memory (/sdcard) to the External Memory (/extsdcard), after the movement and a reboot the original /extsdcard became /sdcard and everything started working again.
I don't mind this set-up (where it seems I'm just losing those ~2GB of internal memory from the edge) but now I have the problem that
I want to wipe that data (stored in /intsdcard) but I'm not able to do so, even with root access via unix terminal or a explorer app.
In both cases I delete files/folders in that /intsdcard location and I receive the message 'successfully deleted' but after refreshing, all files reappear.
Any idea how can this folder be wiped out? All files there belong to root:root and are rwx but still, I'm unable to deleted them.