Yesterday Google pointed me to what pretends to be a datasheet to flash chip SDTNPNAHEM-008G
here, then scroll down and click to expand there:
A pinout (click to open image):
It looks like very close to pinout used by Micron
29F chip, maybe only neccessary to lift leg 38.
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Soldered off the flash chip, and there is its mounting place scanned (click to open image):
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Tried few flash chips, 29f32g08cdf, 29f64g08taa and H27UBG8T2CTR, to no result. Something went wrong, when I soldered sandisk chip back, player still does not work, and it showed 30,6MB empty disk, that eats all writes.