I have tried three more now, two out of three read the file but fail firmware. So for the record, that is out of seven cards, four seem to read, all fail to actually update the firmware of the touchscreen.
What I want to know is has anyone actually managed to flash firmware by switching the card they were using, when the problem isnt that it is not accepting the card, but that the update is attempted but failed.
ETA: Oh I got another one to work by redoing the partitions, it was a used card. Reads but fails! All zeroes on the screen.
ETA2: I found a brand new way for it to not work, if your microsd card is not bein accepted at all by the touchscreen, you can use disk management to delete the existing partition, create a new simple volume and put 7578 as the size, format in FAT32 with 4096 allocation unit size, and the bigger microSD cards can be used to try to flash firmware. Mine is still showing all zeroes, but it didn’t sit at a blank screen like when the microsd card doesnt work at all.