HDD corruption will do that.
and that can happen when equipment is not properly commissioned or maintained, for example when batteries are not connected or are not good.
btw that several early KSS8.3 versions had some problems and should be upgraded. Current 8.3 software is in the 8.3.41+ range. there was a lot of bugfixes that you are missing
thanks for the replay.
1. so without HDD image, there nothing can be done?
2. are updates on KSS free of charge, or KUKA will charge for them? and where to look? (if I get HDD image, will try used robot supplier where machine was bought)