I can't open Messages app on my iPhone 5S with iOS 8.3 (no jailbreak) - it crashes on start. I suspect a malformed message caused this, so I want to delete all messages from all senders to see if it helps.
I tired allowing iOS to delete messages older than 30 days, but it didn't help - the bad message is recent, and I can't afford waiting a month to be able to use SMS again. I also don't have any older backups I could restore.
Is there any way I can delete all messages without opening the app itself? Or some other way this problem could be fixed?