Can you update the stm32duino core to the new version 1.6.0
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Subscribe to Update to Arduino Core for STM32 1.6.0 · Issue #249 · platformio/platform-ststm32 · GitHub 
It looks like there’s some nice stuff, but also some not insignificant changes… so it might take a little while before it’s available.
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I’m really curious about this too. As @pfeerick can attest to, I have an interest in seeing the Maple DFU implemented. 
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Oh good, you saw it… I did have a quick look for that thread so I could ping you here but got distracted 
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