I decided to finally update my Lumia 640XL to Windows 10 (6230.54) today. Being over optimistic (and dum I didn't use contact+message backup app and ended up with most of them missing after the update. I know that at least my text messages are uploaded on cloud, because I was able to access them by Windows Phone Message Backup app on my laptop.
I'm hesitant what should be my next step:
- hard reset?
- downgrade to window 8.1?
- wait patiently (it's been already 12h since I updated)?
Thanks for all advices!