Im Trying to access STM32F401CCU6 in a board i have developed, Using STM32 Cube Programmer with no success.

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Super User

That's a pity, we feel sorry for you.

Hint: maybe someone could help you if you provided some basic information about you problem / schematic, debug connections etc.

My STM32 stuff on github - compact USB device stack and more: https://github.com/gbm-ii/gbmUSBdevice

Guru

Design sounds broken

Work through the design, fix the errors.

Check all the power related pins, that it is correctly orientated.

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Associate

It seems i have no problem erasing and programing the uC in old versions of STM programmer. Only the new STM CUBE is not reading the uC.

Here are some schematics:

Guru

Check firmware and cables

Check connectivity modes, and speeds.

Is NRST connected to the debug pod? Needed for "Connect Under Reset" to work as expected.

ST-LINK/V2 or V3, authentic, or clone?

Avoid using USB Hubs or Docking Stations.

With Micro USB cables make sure to use data or USB 2.0 rated cables, and not charging cables.

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Programming Connector used:

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