As I said in my comment to the original question,
I decide first if the verb is separable. Try the imperative, "Hey, Du, date das up" - doesn't work, so it must be "hey, Du, update das", which makes the part tense also inseparable – geupdatet
My question, in several parts, is:
- Is there a German grammar rule, with respect to the perfect tense of inseparable verbs? If so, what is it?
- Does it apply to loan words?
- Can I determine a separable verb the way I did above, by looking at the imperative? Or is there a better way/rule? If so, what is it?