This community’s system doesn’t seem to allow replies in Japanese, so I’ll write in English. I don’t know what the error is.
Thank you for your kind reply. It was helpful. I only have the F303k8 at hand, so it’s a shame that FLASHIAP is not compatible with that microcontroller. I will purchase a compatible microcontroller and try it out. I will continue to look for ways to do it with F303k8.