FUS_STATE_IMG_NOT_AUTHENTIC during upgrading the FUS

fo · ‎2025-08-14

Hello,

We try to upgrade the BLE stack to the latest 1.23.0. This version requires FUS v.2. We are unable to do this due to the FUS_STATE_IMG_NOT_AUTHENTIC error. We're using STM32CubeProgrammer v. 2.12.0. We have also tried with STM32CubeProgrammer v. 2.20.0following the steps in the release note of the binary files with the same result.

Currently:

- FUS version: 1.2.0.0

- BLE stack version: 1.8.0.3.

We tried on both out custom board and on NUCLEO-WB44 with the same result. Could someone guide us to a solution?

Thanks in advance.

STTwo-32 · ‎2025-08-14

Hello @fo

Could you please try to do that using the STM32CubeProgrammer V2.20.0.

Best Regards.

STTwo-32

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fo · ‎2025-08-14

Hello @STTwo-32

I've tried following on NUCLEO-WB55 using STM32CubeProgrammer v. 2.20.0:

- Upgrade to FUS v1.2.0 for verifying the process: Success

- Upgrade to FUS v2.0.0: Success

- Upgrade to FUS v2.1.0: Success

On our custom board none of the above was succeeded. We only get FUS_STATE_IMG_NOT_AUTHENTIC error.

STTwo-32 · ‎2025-08-14

Could you please send the values of your option bytes, the current version of your FUS/STACK (on a screenshot from the STM32CubeProgrammer if possible) , the exact reference of your MCU and the files that you are using exactly.

Best Regards.

STTwo-32

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fo · ‎2025-08-14

The option bytes are:

and the FUS information is:

We use both the FUS firmware and the stack firmware from stock firmware downloaded by the STM32CubeIDE. The MCU is STM32WB55RGV6.

STTwo-32 · ‎2025-08-15

Hello @fo

Are you sure you are trying to flash the FUs to the correct address. If so, could you please perform a Mass erase before uploading any FUS file.

Best Regards.

STTwo-32

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fo · ‎2025-08-15

I do it in exactly same way as I do with NUCLEO-WB55. I load the FUS v2.0.0.3 in the STM32CubeProgrammer v. 2.20.0 with the "Start address automatic determination" active. With the stack v1.22.0.2 already installed, the programming of FUS returns FUS_STATE_IMG_NO_SPACE. When the stack is deleted, then programming of FUS returns FUS_STATE_IMG_NOT_AUTHENTIC.

I've also tried with the start address 0x080EE000 manually with the same result.