So it seems some things have changed since the creation of: https://developer.community.boschrexroth.com/t5/Store-and-How-to/Update-and-setup-ctrlX-CORE-with-a-microSD-card/ba-p/76638 So what I did, was that I selected the update firmware tool in the web-ui. I inserted a 32GB sd card into the slot of the device, then I selected the firmware-update, chose the System Image archive that I downloaded from the Bosch site, selected the setup archive that I created prior to starting the update and the system selected the sdcard. After rebooting I'm in the current state. Now the UI is complaining about expecting some file named: rexroth-arch01_<VERSION>.img.gz or rexroth-arch01.img.gz, which the linked article seems to show as well, but if I mount my SD card on my mac and have a look, I see this: I hope this additional information helps.
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