Software and commissioning 
  4.2 Install example image on eMMC 
SIMATIC IOT2050 
Operating Instructions, 03/2024, A5E39456816-AF 
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4.2.3.7  Using UART connection 
You can use the UART connection to perform the following tasks: 
•  Enter u-boot shell 
•  Change the boot order 
•  Select a specific boot device 
Permanently change boot order  
1.  Interrupt the boot process by hitting any key when prompted to "Hit the Spacebar to stop 
autoboot". 
You should get "u-boot shell", which is indicated by => or IOT2050