@HoustonDog @hyakinthos OFC, and speed isn't even the problem as @OS1337 is quite smol, so stocking with the royality-free to implement #SPI-Interface may be an option.
Which is kinda sad as I'm shure there are many systems like #DigitalSignage that are somewhat tamper-proof and in the interest of lowering maintenance should be setup as read-only, espechally on cheap flash that has very few write cycles if not lacks wear-leveling and garbage collection...