Flash memory

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Joined Mar 11, 2022
Hello. This maybe doesn't fall into "repairs" but I don't know where to post to. I have 3 identical chartplotters from the boat on my table. Same manufacture, same type, same everything. I was experimenting with flash memory chips and I figure out that when you switch flash memory chip from one to another it wont start up. I have rt809h programmer, and I extracted files from all 3 of them if something goes wrong... Everything is soldered perfectly, i tried like 10 times but nothing. When I put back old EMMC or new one with data from old one everything works. Is flash memory factory chip somehow tied to something else? CPU maybe, or some other memory chips on the board? I don't understand in depth how this works so if someone know more perhaps? Pictures are here