The readme.md file (here) does not list the STM32F446ZE as a supported board. However, 5 months ago this folder was added:
https://github.com/stm32duino/Arduino_Core_STM32/tree/2.0.0/variants/STM32F4xx/F446Z(C-E)(H-J-T)
I believe this means the F446ZE is supported, but the readme.md file hasn't been updated to show this.
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The readme.md file (here) does not list the STM32F446ZE as a supported board. However, 5 months ago this folder was added:
https://github.com/stm32duino/Arduino_Core_STM32/tree/2.0.0/variants/STM32F4xx/F446Z(C-E)(H-J-T)
I believe this means the F446ZE is supported, but the readme.md file hasn't been updated to show this.