015 bad sector recovery enabled, is normal, it's just saying that the recovery bad sectors option is enabled.
It only have bad sectors if it says found bad sector while the image file is uploading.

And no, you must use the same nand flash chip, with the same number.
The cpu data does not known other chips, it will not recognized other nand chips.
Same as the memory chips and even the wireless network if it's build onboard.
Also the mini flash button option is programmed into the cpu, with a small part into the bios rom.

See aliexpress, search there for dm800se Sunray SR4
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Johnny B.

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