How to full erase external Flash by using CubeProgrammer_API?

[LL.5]

I set External Flash Loader through setExternalLoaderPath(). And I can successfully download content to External Flash by using downloadFile(). But what I erased after using massErase() is the MCU Flash. I can't find the related content of full erasing External Flash in the STM32CubeProgrammer_API.chm manual. So how to full erase External Flash by using CubeProgrammer_API?

CubeProgrammer_API version is 2.7.0. (I cannot use the 2.8.0 version, because the 2.8.0 version will cause a fatal error.)