A couple of questions regarding DFU bootloader and STM32F401CE

[JSmit.18]

Hi all,

I am new here and to STM32 in general.

1. Does the STm32F401CE comes from the factory with a DFU bootloader?
2. If so, does a full chip erase with the CubeProgrammer and a stlink v2 erases that factory bootloader?.
3. If so, is the binary of the factory bootloader available so it can be flashed back into the device?

I can't get the DFU bootloader recognized by the CubeProgammer, if it's because of the full chip erases I performed, I wonder if I can program the stock bootloader back. Below is a snapshot of a memory dump of of the bootloader area, I think. I am using STM32F401CE with a 25Mhz external crystal, and everything else works.

[Pavel A.]

Is the DFU device visible to the operating system (Device manager, USB view, lsusb...) ?

[MM..1]

All bootloaders from factory is in system memory and cant be erased.

Read STM32 microcontroller system memory boot mode - Application note

in simple for start boot mode you need on reset have BOOT1 BOOT2 ... pins state

You can write own bootloader and flash it, this can be erased...

[JSmit.18]

Thanks MM..1, that answers my question, factory bootloaders cannot be erased.

BTW, I looked that the document you mentioned before I posted here but I still see where it says that factory bootloaders cannot be erased.