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stm32u5 cube programmer fail to download without full chip erase

junichi ohashi
Associate II

I want to write firmware to stm32u575 using cube programmer, but when I do download from the erase & programming section, it fails to write.

Of course, I have turned off the "skip flash erase before programming" checkbox.

However, if I run the program in automatic mode with the "full chip erase" checkbox checked, it writes successfully.

With the L4 and G4 that I have used in the past, I was able to write successfully in both cases, but with the U5, it fails.

When I use the U5, I use cube programmer.dll to perform full chip erase before downloading.

,Has this behavior changed since the writing of u5 microcontrollers in the specifications?

I have confirmed that the option byte is factory default.


ST Employee

Hello @junichi ohashi 

Could you please share the log? Are you flashing secure firmware? It is possible that the firmware needs to erase/reset the chip before programing the flash.


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this problem source is by my circuit design cause there was no problem encounted in stm32 nucleo u575zi-q.

I will look into the cause now.