The update itself was fairly smooth, for me anyway. On the first attempt, the firmware download stalled, without downloading anything, but I just backed out of it, tried again, and it worked. Both the download and the installation were fairly fast, so I reckon there weren't all that many changes this time.
Once Android was updated, I started the CoDi Assistant, which found 1.1.1.15 and downloaded it quickly. Just trying to install it (I had to try) didn't work, as usual, but after going to flight mode, do not disturb and turning the CoDi off from the notification shade, it flashed successfully in just a few minutes, on the first attempt. I will presume I just got lucky. While previous updates of the CoDi, has been a two-step process, flashing resources and the firmware separately, it seemed to only flash the firmware this time. Perhaps it could (re)use the existing resources?
I mainly look forward to see if the CoDi will be any less unstable now. I usually have to restart mine from the notification shade five or so times a day, when it's stuck showing the Planet logo instead of the time, a broken menu or, most often, nothing. It would also be VERY nice if it could abstain from waking up all the time, unless there is something I might actually want to know - not just that, say, AirMail did NOT find anything to download... but, well, while "not crashing all the time" should be achievable, implementing a useful notification filter is, reasonably, much harder.
[Edit 2021-Jun-04: Fixed a silly typo]