Just updated my X. The process took about 10 minutes start to finish, it did require me to reset the calendar and time, all other presets appeared safe, and the bird tracking looks very promising.
I did have trouble connecting to the OI share app on my iPhone afterwards. I had to scan the QR code to even start the process of pairing, which continually failed. For me, I had to ‘forget‘ the network on my phone, and then reselect it. In doing so, I was prompted to re-enter the wifi password (found under the QR code on the camera screen), and life was good to go after that. Unsure if that helps people with the 5iii glitch or not. So a little annoying there, but otherwise it looks like I’m up and running.