HP ProBook 450 G8: Unknown image

[nastybyte]

Hi,
i used a raspi to read what i assumed is the flash chip on a HP ProBook 450 G8. The chip is a Winbond W25Q256, image is 33554432 bytes and passes the diff test. To my disappointment me_cleaner returns 'Unknown image', and ifdtool says 'No Flash Descriptor in this image'.

The wiki says to post failed attempts here so here i am. What would be your next step if you were prepared to spend some time on this? I guess it might be the wrong chip but could be a lot of other reasons too, i'm very interested i your input to try to figure this out!