That was me. It's been a while since I upgraded firmware, so... trying to recall
Lost my splash screen on upgrade via mobile app, I remember that is normal. Have to reload the image. Don't see a place to do that on mobile. BUT I'm pretty sure now that you have to do that from the desktop Shearwater Cloud app. Shearwater's response to my question was to reload the splash screen. Can't verify because I'm on a dive trip without a BT capable laptop, but I'm pretty sure that's the resolution.
@Shearwater , add that to the wish list... Being able to upgrade firmware without losing/ having to reload the custom splash screen.