With FUS version v2.1.0.0, I am unable to detect any Bluetooth signal.

[ShenChuanAn]

After I upgraded the FUS version to v2.1.0.0, the STACK version was also upgraded to v1.23.0.3 accordingly, as shown in Figure 1. However, I found that after programming the firmware into the STM32WB55CGU6, I could no longer detect any Bluetooth signal.

Is this a problem with the new version? I tested with two boards and encountered the same issue. When the FUS version was v2.0.0.3, the Bluetooth signal was working normally.

I would like to downgrade the FUS version back to v2.0.0.3. How can I do this using STM32CubeProgrammer? I tried performing a full chip erase and re-downloading the stm32wb5x_FUS_fw.bin for v2.0.0.3, but both attempts failed.

[STTwo-32]

Hello @ShenChuanAn 

Could you please try to update the stack and FUS to the last version (as shown on the screenshot) after that, click on the ´Start Wireless stack’ button and upload a BLE Code (it will be better if you test with one of our ST official examples and Nucleo boards).

Best Regards.

STTwo-32