but what do you mean with pure mode? Do you mean expert mode or advance mode?
What can I do if I did it wrong?
If prune mode is enabled, your system doesn't keep all the data that has been downloaded. It only keeps the last x blocks, so the size of the data doesn't exceed a certain amount.
If that's the case, Armory wouldn't sync. Because it needs the entire blockchain.
As I already said, to check this, you can click on "Settings" button and go to "Options".
The "Prune block ....." option should be unchecked.