I had the same question and currently this is not possible. I asked for a function to acknowledge the warning which would stop the yellow blinking. Since this is not a security warning this could be an additional function
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I noticed a timeserver link is no solution for the draining bateries. With an empty battery the clock stalls during powerdown which causes a big offset between the ctrlX-core time and the actual time. Looks like the NTP client does not accept such a big change and therfore does not sync, for result see screenshot:
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Looks like you are trying to update a native core18 device to a core20. This is not possible you need to use the SDcard upgrade method: https://developer.community.boschrexroth.com/t5/ctrlX-CORE/How-to-update-to-RM21-11/td-p/52571
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