Siemens SIMATIC IOT Operating Instructions Manual page 50

Software and commissioning
4.2 Install example image on eMMC
2. To change the boot order, type setenv boot_targets "[devices]"
3. To continue boot with the changed boot order, type boot
Select boot device only for the next boot
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
2. To boot from one specific device, type run bootcmd_<devices>
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Operating Instructions, 03/2024, A5E39456816-AF
SIMATIC IOT2050