[knc1]

That reads/sounds like a victim of "Erase All".

We have a long, detailed thread on how to recover a victim of "Erase All".
We also have detailed postings on replacing the eMMC chip with a new one, which makes it even blanker than "Erase All" does.

Step 1:
Get the system to identify its own RAM chip and initialize it so you can use more than the few hundred bytes of RAM built into the SoC chip.

Note: Eliminate the need to translate to/from Windoze by running a complete Linux installation (such as a Linux LiveCD), not just another embedded (ham stringed) embedded system.