STM32F103 bootloader issue

[Tsugi.1]

Hi all.

I am using the STM32F103RBT6 microcontroller.

Some MCUs mounted on the board did not run the bootloader.

When I checked system memory ​address(0x1FFFF000 - 0x1FFFF800) with STM32CUBEIDE ,

The range of the address is filled with 0xff(attached file).

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Is there any way to recover MCUs in this situation?

A picture of the faulty MCUs package is attached.

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MCUs that can communicate with the bootloader have some binary written in the system memory.

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Thank you

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[Tsugi.1]

The system memory of the MCU that can communicate with the bootloader is shown in the attached file.

[Peter BENSCH]

Welcome, @Tsugi.1​, to the community!

To exclude a fake as far as possible, please check the system memory (0x1FFFF000) and also the unique device ID (0x1FFFF7E8) with the STM32CubeProgrammer.

Regards

/Peter

[Tsugi.1]

Thank you for your reply.

the address of unique device ID(0x1FFFF7E8) is written some binary(attach file).

but address of system memory(0x1FFFF000) is filled with 0xff

[Tsugi.1]

address of  system memory (0x1FFFF000) is filled with 0xff

[TDK]

Barring a weird STM32CubeProgrammer communication issue, your chip is likely counterfeit and is missing a bootloader. 0x1FFFF000 is in ROM which you can't write to. The UID looks bad as well.