Firmware/BIOS description SIMATIC IPC BX-39A, IPC PX-39A, IPC PX-39A PRO 
42  Operating Instructions, 01/2023, A5E51110693-AA 
Note 
The "USB Boot" option has to be set to "Enabled" in the "Boot" tab so that the device can boot 
from the USB stick. 
1.  Connect the USB stick to the device. 
2.  Open the firmware selection menu (Page 8). 
3.  Select "Boot-Manager." 
4.  Select the USB medium in the "Boot-Manager" and confirm the entry.