Custom STM32WB55CC board - unable to upgrade FUS

Hi,

I am developing an application for custom built STM32WB55CC board. Everything seems to be fine, however I am not able to upgrade FUS from v0.5.3. I am reproducing steps from release notes attached inside 1.8.0 FW pack. Please find a log from deleting old FUS:

PS C:\Program Files\STMicroelectronics\STM32Cube\STM32CubeProgrammer\bin> .\STM32_Programmer_CLI.exe -c port=usb1 -fwdelete
 -------------------------------------------------------------------
 STM32CubeProgrammer v2.5.0
 -------------------------------------------------------------------
 
 
 
USB speed : Full Speed (12MBit/s)
Manuf. ID : STMicroelectronics
Product ID : DFU in FS Mode
SN : 206A3261554D
FW version : 0x011a
Device ID : 0x0495
Device name : STM32WBxx
Flash size : 256 KBytes
Device type : MCU
Device CPU : Cortex-M0+/M4
 
 
FUS state is FUS_SERVICE_ONGOING
 
FUS status is FUS_IMAGE_NOT_FOUND
 
FUS state is FUS_IDLE
 
FUS status is FUS_NO_ERROR
Deleting firmware ...

After "Deleting firmware ..." there is an immediate USB disconneting sound, DFU disappears from Device Manager and CubeProgrammer execution ends after around 12-13 seconds without giving any error.

Can you please help me?

BR,

Bart