I'm sorry if this has already been asked and answered, it probably has; however I was unable to search my way to an answer. On this web page, methods are outlined for how to revert from iOS 11 beta to 10.3.3. I have looked into a couple of other instructions on the web, too. However, in the particular case of "method 1" in the article in question, there seems to be some hope that on device data is maintained. The hope arises from the fact that loss of data is not mentioned. Other places I've read that all data on device will be lost and that it will not be possible to reinstall anything from a previous iOS 11 backup – which makes sense, even to me who's not very much in the know about these things. Do you think "method 1" will maintain on device data? To be precise: I'm specifically concerned about messages. Everything else is in the cloud (and for a while, messages was too …). Thanks.